November 2025 - ffmpeg-user - lists.ffmpeg.org

ffmpeg 8 between filter
by dorita borita 26 Nov '25

26 Nov '25

Hello, I'm using the `between` filter to cut a video. In ffmpeg 7, this works perfectly. In the new version 8, the video is cut, but the audio isn't. ffmpeg.exe -loglevel error -stats -copyts -i input.mkv -y -vf select='between(t,36.04,76.04)+between(t,404.48,444.48)',setpts=N/FRAME_RATE/TB -preset ultrafast -tune film -map 0:v -c:v libx264 -crf 22 -map 0:1? -c:a:0 aac -b:a:0 160k -filter:a:0 aselect='between(t,36.04,76.04)+between(t,404.48,444.48)',asetpts=N/SR/TB -disposition:a:0 default -map_chapters 0 -max_interleave_delta 0 -reset_timestamps 1 output.mkv

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ffmpeg ignores MP3 comment tag when transcodiing
by Ulf Zibis 26 Nov '25

26 Nov '25

Hi, when i use the lame encoder directly, the comment tag of a mp3 file is conserved: $ lame -V1 in.mp3 out.mp3 LAME 3.100 64bits (http://lame.sf.net) Using polyphase lowpass filter, transition band: 19383 Hz - 19916 Hz Encoding in.mp3 to out.mp3 Encoding as 44.1 kHz j-stereo MPEG-1 Layer III VBR(q=1) Frame | CPU time/estim | REAL time/estim | play/CPU | ETA 10104/10104 (100%)| 0:04/ 0:04| 0:04/ 0:04| 54.411x| 0:00 32 [ 29] * 40 [ 0] 48 [ 0] 56 [ 0] 64 [ 0] 80 [ 0] 96 [ 0] 112 [ 2] % 128 [ 0] 160 [ 0] 192 [ 2473] %%%%%%%%%%%%%%%%%%%%%%%%%%%%* 224 [ 5892] %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 256 [ 1506] %%%%%%%%%%%%%%%%%* 320 [ 202] %%% ------------------------------------------------------------------------------- kbps LR MS % long switch short % 222.3 98.3 1.7 95.7 2.3 2.0 Writing LAME Tag...done ReplayGain: +2.1dB $ mediainfo out.mp3 General Complete name : out.mp3 Format : MPEG Audio File size : 7.04 MiB Duration : 4 min 23 s Overall bit rate mode : Variable Overall bit rate : 222 kb/s Album : A Momentary Lapse Of Reason Album/Performer : Pink Floyd Track name : Signs Of Life Track name/Position : 01 Performer : Pink Floyd Genre : Rock Recorded date : 1987 Writing library : LAME3.100 Cover : Yes Cover type : Cover (front) Cover MIME : image/jpeg Comment : Columbia Records 2005 Remastered Edition. Audio Format : MPEG Audio Format version : Version 1 Format profile : Layer 3 Format settings : Joint stereo Duration : 4 min 23 s Bit rate mode : Variable Bit rate : 222 kb/s Minimum bit rate : 32.0 kb/s Channel(s) : 2 channels Sampling rate : 44.1 kHz Frame rate : 38.281 FPS (1152 SPF) Compression mode : Lossy Stream size : 6.99 MiB (99%) Writing library : LAME3.100 Encoding settings : -m j -V 1 -q 0 -lowpass 19.5 --vbr-new -b 32 Image Format : JPEG Width : 500 pixels Height : 500 pixels Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Compression mode : Lossy Stream size : 51.9 KiB (1%) Using ffmpeg, the comment tag is lost: $ ffmpeg -i in.mp3 -q 1 -c:v copy out.mp3 ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers built with gcc 13 (Ubuntu 13.2.0-23ubuntu3) configuration: --prefix=/usr --extra-version=3ubuntu5 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --disable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 58. 29.100 / 58. 29.100 libavcodec 60. 31.102 / 60. 31.102 libavformat 60. 16.100 / 60. 16.100 libavdevice 60. 3.100 / 60. 3.100 libavfilter 9. 12.100 / 9. 12.100 libswscale 7. 5.100 / 7. 5.100 libswresample 4. 12.100 / 4. 12.100 libpostproc 57. 3.100 / 57. 3.100 Incorrect BOM value Error reading comment frame, skipped Incorrect BOM value Error reading lyrics, skipped Input #0, mp3, from 'in.mp3': Metadata: album : A Momentary Lapse Of Reason genre : Rock title : Signs Of Life artist : Pink Floyd track : 01 album_artist : Pink Floyd date : 1987 Duration: 00:04:23.97, start: 0.025056, bitrate: 321 kb/s Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s Metadata: encoder : LAME3.97 Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 500x500 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn (attached pic) Metadata: comment : Cover (front) Stream mapping: Stream #0:1 -> #0:0 (copy) Stream #0:0 -> #0:1 (mp3 (mp3float) -> mp3 (libmp3lame)) Press [q] to stop, [?] for help Output #0, mp3, to 'out.mp3': Metadata: TALB : A Momentary Lapse Of Reason TCON : Rock TIT2 : Signs Of Life TPE1 : Pink Floyd TRCK : 01 TPE2 : Pink Floyd TDRC : 1987 TSSE : Lavf60.16.100 Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 500x500 [SAR 1:1 DAR 1:1], q=2-31, 90k tbr, 90k tbn (attached pic) Metadata: comment : Cover (front) Stream #0:1: Audio: mp3, 44100 Hz, stereo, fltp Metadata: encoder : Lavc60.31.102 libmp3lame [out#0/mp3 @ 0x5853cd73b540] video:52kB audio:7174kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005825% size= 7226kB time=00:04:23.89 bitrate= 224.3kbits/s speed=53.3x $ mediainfo out.mp3 General Complete name : out.mp3 Format : MPEG Audio File size : 7.06 MiB Duration : 4 min 23 s Overall bit rate mode : Variable Overall bit rate : 223 kb/s Album : A Momentary Lapse Of Reason Album/Performer : Pink Floyd Track name : Signs Of Life Track name/Position : 01 Performer : Pink Floyd Genre : Rock Recorded date : 1987 Writing library : LAME3.100 Cover : Yes Cover type : Cover (front) Cover MIME : image/jpeg Audio Format : MPEG Audio Format version : Version 1 Format profile : Layer 3 Format settings : Joint stereo Duration : 4 min 23 s Bit rate mode : Variable Bit rate : 224 kb/s Channel(s) : 2 channels Sampling rate : 44.1 kHz Frame rate : 38.281 FPS (1152 SPF) Compression mode : Lossy Stream size : 7.01 MiB (99%) Writing library : LAME3.100 Image Format : JPEG Width : 500 pixels Height : 500 pixels Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Compression mode : Lossy Stream size : 51.9 KiB (1%) How can I conserve the comment tag? -Ulf

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Re: [mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY...
by 桃源老師 26 Nov '25

26 Nov '25

> 2025/11/23 午前8:32、桃源老師 <xanadu6291(a)gmail.com <mailto:xanadu6291@gmail.com>>のメール: > $ caffeinate -di ffmpeg -init_hw_device vulkan -i C2_t04.mkv -vf format=yuv420p,hwupload,libplacebo=w=1920:h=1080:custom_shader_path=Anime4K_Clamp_Highlights.glsl,libplacebo=custom_shader_path=Anime4K_Restore_CNN_M.glsl,libplacebo=custom_shader_path=Anime4K_Upscale_CNN_x2_M.glsl,libplacebo=custom_shader_path=Anime4K_AutoDownscalePre_x2.glsl,libplacebo=custom_shader_path=Anime4K_AutoDownscalePre_x4.glsl,libplacebo=custom_shader_path=Anime4K_Upscale_CNN_x2_S.glsl,hwdownload,format=yuv420p -c:v libx264 -preset medium -crf 18 -level 5.1 -c:a copy -c:s copy C2_t04_ffmpeg_Anime4K_1080.mkv > > And I got "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." message several times at very first of encoding, but I get resulting output and it seems to be fine... > Is this "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." error can be safely ignored or is this error harmful? Just following-up to my post... Firstly, my ffmpeg command initializing vulkan was completely wrong. I used: -init_hw_device vulkan but, it should be: -init_hw_device "vulkan=vk:0" -hwaccel vulkan -hwaccel_output_format vulkan or: -init_hw_device "vulkan=vk:0" -filter_hw_device vk Secondarily, l used libplacebo custom shader multiple times, but it seems accept only one, single shader. And this might be the cause of "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." message... Then, I just concatenate each shader using cat command. This seems like worked, but resulting output video have unacceptable artifacts... I confirmed my concatenated shader with mpv player, then found those artifacts exists. They exists even though the shader applied as independent glsl file. So I suspect that Anime4K shader is not usable because of my poor hardware, Apple M2. Or my poor understandings with shader and so on... I'm now trying to use ewa_lanczos to scaling up my input video... If those follow-up have any misunderstandings or any wrong, kindly teach me... Best Regards, Togen-Roushi

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Re: [mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY...
by 桃源老師 26 Nov '25

26 Nov '25

2025/11/23 午前8:32、桃源老師 <xanadu6291(a)gmail.com>のメール: $ caffeinate -di ffmpeg -init_hw_device vulkan -i C2_t04.mkv -vf format=yuv420p,hwupload,libplacebo=w=1920:h=1080:custom_shader_path=Anime4K_Clamp_Highlights.glsl,libplacebo=custom_shader_path=Anime4K_Restore_CNN_M.glsl,libplacebo=custom_shader_path=Anime4K_Upscale_CNN_x2_M.glsl,libplacebo=custom_shader_path=Anime4K_AutoDownscalePre_x2.glsl,libplacebo=custom_shader_path=Anime4K_AutoDownscalePre_x4.glsl,libplacebo=custom_shader_path=Anime4K_Upscale_CNN_x2_S.glsl,hwdownload,format=yuv420p -c:v libx264 -preset medium -crf 18 -level 5.1 -c:a copy -c:s copy C2_t04_ffmpeg_Anime4K_1080.mkv And I got "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." message several times at very first of encoding, but I get resulting output and it seems to be fine... Is this "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." error can be safely ignored or is this error harmful? Just following-up to my post... Firstly, my ffmpeg command initializing vulkan was completely wrong. I used: -init_hw_device vulkan but, it should be: -init_hw_device "vulkan=vk:0" -hwaccel vulkan -hwaccel_output_format vulkan or: -init_hw_device "vulkan=vk:0" -filter_hw_device vk Secondarily, l used libplacebo custom shader multiple times, but it seems accept only one, single shader. And this might be the cause of "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." message... Then, I just concatenate each shader using cat command. This seems like worked, but resulting output video have unacceptable artifacts... I confirmed my concatenated shader with mpv player, then found those artifacts exists. They exists even though the shader applied as independent glsl file. So I suspect that Anime4K shader is not usable because of my poor hardware, Apple M2. Or my poor understandings with shader and so on... I'm now trying to use ewa_lanczos to scaling up my input video... If those follow-up have any misunderstandings or any wrong, kindly teach me... Best Regards, Togen-Roushi

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About FFmpeg transcoding issue
by 5112 Ian 26 Nov '25

26 Nov '25

Hello, I want to ask a question about ffmpeg transcoding. First, here are my parameters: exec_static ffmpeg -hide_banner -loglevel repeat+level+warning -err_detect ignore_err -fflags +genpts+igndts+discardcorrupt+nobuffer -avoid_negative_ts make_zero -flags low_delay -rtmp_buffer 100 -rw_timeout 15000000 -analyzeduration 10000000 -probesize 10000000 -i "rtmp://aaa.bbb.com/abc/live?reconnect=1&reconnect_streamed=1&reconnect_dela…" -map 0:v -map 0:a -c:v libx264 -profile:v baseline -preset veryfast -tune zerolatency -x264opts "keyint=30:min-keyint=30:scenecut=0:force-cfr=1" -b:v 2000k -maxrate 7000k -bufsize 3500k -c:a aac -ac 1 -vf scale=-2:1080 -flvflags no_duration_filesize+no_sequence_end -f flv rtmp://localhost/test/abc_1080p -map 0:v -map 0:a -c:v libx264 -profile:v baseline -preset ${preset} -tune zerolatency -x264opts "keyint=30:min-keyint=30:scenecut=0:force-cfr=1" -b:v 2000k -maxrate 7000k -bufsize 3500k -c:a aac -ac 1 -vf scale=-2:720 -flvflags no_duration_filesize+no_sequence_end -f flv rtmp://localhost/test/abc_720p -map 0:v -map 0:a -c:v libx264 -profile:v baseline -preset ${preset} -tune zerolatency -x264opts "keyint=30:min-keyint=30:scenecut=0:force-cfr=1" -b:v 2000k -maxrate 7000k -bufsize 3500k -c:a aac -ac 1 -vf scale=-2:480 -flvflags no_duration_filesize+no_sequence_end -f flv rtmp://localhost/test/abc_480p 2>>/var/log/nginx/ffmpeg.log; With these parameters, the transcoding latency and playback are normal. However, when RTMP becomes unstable—such as during network instability, jitter, or when the stream reconnects—the transcoding sometimes breaks and playback fails. The log shows: [aost#0:1/aac @ 0x6036eb9941c0] [warning] Non-monotonic DTS; previous: 88537152, current: 1209813; changing to 88537152. This may result in incorrect timestamps in the output file. This log keeps repeating. Is there a better way to solve this problem? Is there a way to reconnect RTMP? Because RTMP administrators cannot control stability. FFmpeg version: 7.1.2

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dvdvideo + vaapi : "Impossible to convert between the formats" at the end of the process
by calimou＠free.fr 25 Nov '25

25 Nov '25

Hello, I'm using dvdvideo demuxer to encode some of my old DVDs. I'm using Solus Linux distro. The ffmpeg command below works, I mean I get a working and readable h264 file in the end, there only is a strange error at the end of the process that I am curious what it is about. Solving it would definitively makes me happy and stop using HandBrake (which doesn't ship vaapi) ;) Here is ffmpeg version and settings: ffmpeg version 7.1.1 Copyright (c) 2000-2025 the FFmpeg developers built with clang version 19.1.6 (Solus 19.1.6-130) configuration: --enable-gcrypt --enable-gnutls --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libcdio --enable-libdav1d --enable-libdvdnav --enable-libdvdread --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libjxl --enable-liblc3 --enable-libmp3lame --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librubberband --enable-libshaderc --enable-libsmbclient --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libtwolame --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --enable-lto --enable-nvdec --enable-nvenc --enable-openal --enable-opengl --enable-sdl2 --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan --disable-debug --disable-static --disable-stripping --libdir=/usr/lib64 --prefix=/usr --cc=clang --cxx=clang++ The command I'm using is below. I'm using vaapi hardware encoding (AMD RX 6700). The $SOURCE is a folder that contains the DVD data (it is a mounted iso). ffmpeg -f dvdvideo -title 4 -i "$SOURCE" \ -map 0:v:0 \ -map 0:a:m:language:jpn \ -disposition +0 \ -c:v h264_vaapi \ -vaapi_device /dev/dri/renderD128 \ -vf 'format=nv12,hwupload' \ -b:v 3500k \ -ac 2 \ -metadata title="$DISC_NAME" \ "$OUTPUT_FILE" \ -y It works well, until the end of the stream is reached. Below log extract (the libdvdcss is expected I suppose ?) [dvdvideo @ 0x56113a52c940] libdvdread: Could not open /dev/loop0 with libdvdcss. [dvdvideo @ 0x56113a52c940] libdvdread: Can't open /dev/loop0 for reading [dvdvideo @ 0x56113a52c940] libdvdread: Device /dev/loop0 inaccessible, CSS authentication not available. [dvdvideo @ 0x56113a52c940] libdvdnav: Could not open /dev/loop0 with libdvdcss. [dvdvideo @ 0x56113a52c940] libdvdnav: Can't open /dev/loop0 for reading [dvdvideo @ 0x56113a52c940] libdvdnav: Device /dev/loop0 inaccessible, CSS authentication not available. [dvdvideo @ 0x56113a52c940] libdvdnav: Can't read name block. Probably not a DVD-ROM device. [dvdvideo @ 0x56113a52c940] libdvdnav: vm: dvd_read_name failed Input #0, dvdvideo, from $SOURCE: Duration: 00:01:34.48, start: 0.000000, bitrate: N/A Chapters: Chapter #0:0: start 0.000000, end 94.000000 Chapter #0:1: start 94.000000, end 94.480000 Stream #0:0[0x1e0]: Video: mpeg2video, yuv420p(tv, top first), 720x576, SAR 64:45 DAR 16:9, 25 fps, 25 tbr, 90k tbn Side data: cpb: bitrate max/min/avg: 9300000/0/0 buffer size: 0 vbv_delay: N/A Stream #0:1[0x80](jpn): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s Stream mapping: Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (h264_vaapi)) Stream #0:1 -> #0:1 (ac3 (native) -> aac (native)) Press [q] to stop, [?] for help Output #0, mp4, to './converted_dvds/abc.mp4': Metadata: title : (the source title) encoder : Lavf61.7.100 Chapters: Chapter #0:0: start 0.000000, end 94.000000 Chapter #0:1: start 94.000000, end 94.480000 Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), vaapi(tv, top coded first (swapped)), 720x576 [SAR 64:45 DAR 16:9], q=2-31, 3500 kb/s, 25 fps, 12800 tbn Metadata: encoder : Lavc61.19.101 h264_vaapi Stream #0:1(jpn): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s Metadata: encoder : Lavc61.19.101 aac [vf#0:0 @ 0x56113a7cb400] Reconfiguring filter graph because video parameters changed to yuv420p(tv, fcc), 720x576 ^^^^^^^^^^^^^^^^^^THIS^^^^^^^^^^^^^^ Impossible to convert between the formats supported by the filter 'Parsed_hwupload_1' and the filter 'auto_scale_1' ^^^^^^^^^^^^^^^^^^THIS^^^^^^^^^^^^^ [vf#0:0 @ 0x56113a7cb400] Error reinitializing filters! [vf#0:0 @ 0x56113a7cb400] Task finished with error code: -38 (Function not implemented) [vf#0:0 @ 0x56113a7cb400] Terminating thread with return code -38 (Function not implemented) [out#0/mp4 @ 0x56113a77bfc0] video:37429KiB audio:1435KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.166576% frame= 2348 fps=624 q=-0.0 Lsize= 38928KiB time=00:01:31.96 bitrate=3467.5kbits/s speed=24.4x [aac @ 0x56113a792ac0] Qavg: 1585.304 Conversion failed! I suspect the change happens whenever it reach the end and therefore try to seek to a DVD menu or something like that. Below the output of ffplay on the same title: near ~98% I get: [dvdvideo @ 0x7f3a8c000c80] new block: i=5 nav_event=7 nav_len=2048 cur_title=4 cur_ptt=2 cur_angle=1 cur_celln=2 cur_pgcn=1 cur_pgn=2 play_in_vts=1 play_in_pgc=1 play_in_ps=1 [dvdvideo @ 0x7f3a8c000c80] NAV packet: s_ptm=8492400 e_ptm=8535600 scr=8469796 lbn=46230 vobu_duration=43200 nav_pts=8460000 [dvdvideo @ 0x7f3a8c000c80] libdvdnav: Language 'en' not found, using 'fr' instead [dvdvideo @ 0x7f3a8c000c80] libdvdnav: Menu Languages available: fr (repeated) [mpeg2video @ 0x7f3a8c03ff80] Format yuv420p chosen by get_format(). [ffplay_buffer @ 0x7f3a74abaf40] Changing video frame properties on the fly is not supported by all filters. [ffplay_buffer @ 0x7f3a74abaf40] filter context - w: 720 h: 576 fmt: 0 csp: unknown range: tv, incoming frame - w: 720 h: 576 fmt: 0 csp: fcc range: tv pts_time: 98.135122 [swscaler @ 0x7f3a7473a6c0] [swscaler @ 0x7f3a74a01b80] YUV color matrix differs for YUV->YUV, using intermediate RGB to convert (repeated) [swscaler @ 0x7f3a7473a6c0] [swscaler @ 0x7f3a746abc80] YUV color matrix differs for YUV->YUV, using intermediate RGB to convert [swscaler @ 0x7f3a7473a6c0] [swscaler @ 0x7f3a746b8c40] YUV color matrix differs for YUV->YUV, using intermediate RGB to convert [auto_scale_0 @ 0x7f3a74abb300] w:720 h:576 fmt:yuv420p csp:unknown range:tv sar:0/1 -> w:720 h:576 fmt:yuv420p csp:bt709 range:tv sar:0/1 flags:0x00000004 [auto_scale_0 @ 0x7f3a74abb300] [framesync @ 0x7f3a7455bbe8] Sync level 1 [swscaler @ 0x7f3a7473a6c0] [swscaler @ 0x7f3a74a01b80] YUV color matrix differs for YUV->YUV, using intermediate RGB to convert [swscaler @ 0x7f3a7473a6c0] [swscaler @ 0x7f3a74498e00] YUV color matrix differs for YUV->YUV, using intermediate RGB to convert (repeated) [auto_scale_0 @ 0x7f3a74abb300] w:720 h:576 fmt:yuv420p csp:unknown range:tv sar:0/1 -> w:720 h:576 fmt:yuv420p csp:bt709 range:tv sar:0/1 flags:0x00000004 [auto_scale_0 @ 0x7f3a74abb300] [framesync @ 0x7f3a7455bbe8] Sync level 1 [swscaler @ 0x7f3a7473a6c0] [swscaler @ 0x7f3a74a01b80] YUV color matrix differs for YUV->YUV, using intermediate RGB to convert (repeated) [auto_scale_0 @ 0x7f3a74abb300] w:720 h:576 fmt:yuv420p csp:fcc range:tv sar:0/1 -> w:720 h:576 fmt:yuv420p csp:bt709 range:tv sar:0/1 flags:0x00000004 [auto_scale_0 @ 0x7f3a74abb300] [framesync @ 0x7f3a7455bbe8] Sync level 1 [ffplay_buffer @ 0x7f3a74abaf40] Changing video frame properties on the fly is not supported by all filters. [ffplay_buffer @ 0x7f3a74abaf40] filter context - w: 720 h: 576 fmt: 0 csp: unknown range: tv, incoming frame - w: 720 h: 576 fmt: 0 csp: fcc range: tv pts_time: 98.175122 I don't know what else to try at this point but that would be wonderful to have a success return value from ffmpeg. Maybe something to prevent going through the format change and exit ? Regards, Martin

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ffmpeg-user added "Cc:" header, and it's wrong.
by Mark Filipak 24 Nov '25

24 Nov '25

In the message I just wrote to ffmpeg-user, it appears that ffmpeg-user added a "Cc:" header. Not only is that undesired, the "Cc:" header is wrong.

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Concatenate WAV file content with periods of silence between file content blocks
by Julian Salerno 23 Nov '25

23 Nov '25

I use ffmpeg in a very simple command to concatenate WAV audio files: ffmpeg -f concat -i ffmpeg_wav_file_order.txt -c copy outputFile.wav where ffmpeg_wav_file_order.txt contains for example: file file1.wav file file2.wav file file3.wav All good. Now, I would like to be able to specify periods of silence between the files, for example: * no period of silence before file1 start-of-content * 1 sec period of silence between file1 end-of-content and file2 start-of-content * 2.2 sec period of silence between file2 end-of-content and file3 start-of-content Can somebody offer a simple solution ?

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[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY...
by 桃源老師 22 Nov '25

22 Nov '25

Hello, ffmpeg experts... I have 720x480 mpeg2 video. I'd like to upscale this video to 1920x1080, using Anime4k shader. The ffmpeg command I run is the following: $ caffeinate -di ffmpeg -init_hw_device vulkan -i C2_t04.mkv -vf format=yuv420p,hwupload,libplacebo=w=1920:h=1080:custom_shader_path=Anime4K_Clamp_Highlights.glsl,libplacebo=custom_shader_path=Anime4K_Restore_CNN_M.glsl,libplacebo=custom_shader_path=Anime4K_Upscale_CNN_x2_M.glsl,libplacebo=custom_shader_path=Anime4K_AutoDownscalePre_x2.glsl,libplacebo=custom_shader_path=Anime4K_AutoDownscalePre_x4.glsl,libplacebo=custom_shader_path=Anime4K_Upscale_CNN_x2_S.glsl,hwdownload,format=yuv420p -c:v libx264 -preset medium -crf 18 -level 5.1 -c:a copy -c:s copy C2_t04_ffmpeg_Anime4K_1080.mkv And I got "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." message several times at very first of encoding, but I get resulting output and it seems to be fine... ffmpeg version N-121817-gfc3893f5e7 Copyright (c) 2000-2025 the FFmpeg developers built with Apple clang version 17.0.0 (clang-1700.4.4.1) configuration: --disable-static --enable-shared --pkg-config-flags=--static --enable-gpl --enable-version3 --enable-nonfree --enable-libmp3lame --enable-libfdk-aac --enable-libvo-amrwbenc --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvorbis --enable-libspeex --enable-libopus --enable-libgsm --enable-libtwolame --enable-libsoxr --enable-libmodplug --enable-libopenjpeg --enable-libwebp --enable-libtheora --enable-libx264 --enable-libopenh264 --enable-libx265 --enable-libxvid --enable-libvpx --enable-libxavs --enable-libfreetype --enable-libharfbuzz --enable-fontconfig --enable-libfribidi --enable-libass --enable-libbluray --enable-libvidstab --enable-libsnappy --enable-libzmq --enable-libzvbi --enable-libzimg --enable-libaom --enable-libdav1d --enable-libmysofa --enable-librubberband --enable-libshine --enable-libvmaf --enable-libsvtav1 --enable-libxml2 --enable-libplacebo --enable-lcms2 --enable-whisper --enable-lzma libavutil 60. 18.100 / 60. 18.100 libavcodec 62. 19.100 / 62. 19.100 libavformat 62. 6.103 / 62. 6.103 libavdevice 62. 2.100 / 62. 2.100 libavfilter 11. 9.100 / 11. 9.100 libswscale 9. 3.100 / 9. 3.100 libswresample 6. 2.100 / 6. 2.100 Input #0, matroska,webm, from 'C2_t04.mkv': Metadata: encoder : libmakemkv v1.18.2 (1.3.10/1.5.2) darwin(arm64-release) creation_time : 2025-11-21T06:11:35.000000Z Duration: 00:02:15.14, start: 0.000000, bitrate: 5677 kb/s Chapters: Chapter #0:0: start 0.000000, end 133.133000 Metadata: title : Chapter 01 Chapter #0:1: start 133.133000, end 135.135000 Metadata: title : Chapter 02 Stream #0:0(eng): Video: mpeg2video (Main), yuv420p(tv, top first), 720x480 [SAR 32:27 DAR 16:9], SAR 853:720 DAR 853:480, 29.97 fps, 29.97 tbr, 1k tbn Metadata: BPS-eng : 5479281 DURATION-eng : 00:02:15.135000000 NUMBER_OF_FRAMES-eng: 4050 NUMBER_OF_BYTES-eng: 92555332 SOURCE_ID-eng : 0100E0 _STATISTICS_WRITING_APP-eng: MakeMKV v1.18.2 darwin(arm64-release) _STATISTICS_WRITING_DATE_UTC-eng: 2025-11-21 06:11:35 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID Side data: CPB properties: bitrate max/min/avg: 9800000/0/0 buffer size: 1835008 vbv_delay: N/A Stream #0:1(jpn): Audio: ac3, 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: title : Stereo BPS-eng : 192000 DURATION-eng : 00:02:15.072000000 NUMBER_OF_FRAMES-eng: 4221 NUMBER_OF_BYTES-eng: 3241728 SOURCE_ID-eng : 0180BD _STATISTICS_WRITING_APP-eng: MakeMKV v1.18.2 darwin(arm64-release) _STATISTICS_WRITING_DATE_UTC-eng: 2025-11-21 06:11:35 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID File 'C2_t04_ffmpeg_Anime4K_1080.mkv' already exists. Overwrite? [y/N] y Stream mapping: Stream #0:0 -> #0:0 (mpeg2video (native) -> h264 (libx264)) Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help [mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY: Could not create MTLCounterSampleBuffer of size 128, for 16 queries, in query pool of type VK_QUERY_TYPE_TIMESTAMP. Reverting to emulated behavior. (Error code 0): Cannot allocate sample buffer [snip] [mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY: Could not create MTLCounterSampleBuffer of size 128, for 16 queries, in query pool of type VK_QUERY_TYPE_TIMESTAMP. Reverting to emulated behavior. (Error code 0): Cannot allocate sample buffer [libx264 @ 0xbd2ea8380] using SAR=2559/2560 [libx264 @ 0xbd2ea8380] using cpu capabilities: ARMv8 NEON DotProd I8MM [libx264 @ 0xbd2ea8380] profile High, level 5.1, 4:2:0, 8-bit [libx264 @ 0xbd2ea8380] 264 - core 165 r3223 0480cb0 - H.264/MPEG-4 AVC codec - Copyleft 2003-2025 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=18.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, matroska, to 'C2_t04_ffmpeg_Anime4K_1080.mkv': Metadata: encoder : Lavf62.6.103 Chapters: Chapter #0:0: start 0.000000, end 133.133000 Metadata: title : Chapter 01 Chapter #0:1: start 133.133000, end 135.135000 Metadata: title : Chapter 02 Stream #0:0(eng): Video: h264 (H264 / 0x34363248), yuv420p(tv, top coded first (swapped)), 1920x1080 [SAR 2559:2560 DAR 853:480], q=2-31, 29.97 fps, 1k tbn Metadata: encoder : Lavc62.19.100 libx264 BPS-eng : 5479281 DURATION-eng : 00:02:15.135000000 NUMBER_OF_FRAMES-eng: 4050 NUMBER_OF_BYTES-eng: 92555332 SOURCE_ID-eng : 0100E0 _STATISTICS_WRITING_APP-eng: MakeMKV v1.18.2 darwin(arm64-release) _STATISTICS_WRITING_DATE_UTC-eng: 2025-11-21 06:11:35 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID Side data: CPB properties: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A Stream #0:1(jpn): Audio: ac3 ([0] [0][0] / 0x2000), 48000 Hz, stereo, fltp, 192 kb/s (default) Metadata: title : Stereo BPS-eng : 192000 DURATION-eng : 00:02:15.072000000 NUMBER_OF_FRAMES-eng: 4221 NUMBER_OF_BYTES-eng: 3241728 SOURCE_ID-eng : 0180BD _STATISTICS_WRITING_APP-eng: MakeMKV v1.18.2 darwin(arm64-release) _STATISTICS_WRITING_DATE_UTC-eng: 2025-11-21 06:11:35 _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID frame= 0 fps=0.0 q=0.0 size= 2KiB time=N/A bitrate=N/A speed=N/A elapseframe= 0 fps=0.0 q=0.0 size= 2KiB time=N/A bitrate=N/A speed=N/A elapseframe= 1 fps=0.5 q=24.0 size= 2KiB time=-00:00:00.03 bitrate=N/A speed=frame= 20 fps=7.9 q=24.0 size= 2KiB time=00:00:00.60 bitrate= 22.0kbitsframe= 38 fps= 13 q=24.0 size= 2KiB time=00:00:01.20 bitrate= 11.0kbits [snip] frame= 3969 fps= 35 q=24.0 size= 124416KiB time=00:02:12.36 bitrate=7700.0kbitsframe= 3988 fps= 35 q=24.0 size= 124416KiB time=00:02:12.99 bitrate=7663.3kbits[out#0/matroska @ 0xbd31c8300] video:121657KiB audio:3166KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: 0.049954% frame= 4050 fps= 35 q=-1.0 Lsize= 124885KiB time=00:02:15.06 bitrate=7574.4kbits/s speed=1.17x elapsed=0:01:55.78 [libx264 @ 0xbd2ea8380] frame I:98 Avg QP:14.90 size:178833 [libx264 @ 0xbd2ea8380] frame P:1155 Avg QP:17.29 size: 50848 [libx264 @ 0xbd2ea8380] frame B:2797 Avg QP:19.67 size: 17276 [libx264 @ 0xbd2ea8380] consecutive B-frames: 6.0% 4.6% 3.3% 86.1% [libx264 @ 0xbd2ea8380] mb I I16..4: 13.2% 66.2% 20.6% [libx264 @ 0xbd2ea8380] mb P I16..4: 3.2% 7.0% 3.2% P16..4: 34.7% 14.3% 8.9% 0.0% 0.0% skip:28.8% [libx264 @ 0xbd2ea8380] mb B I16..4: 0.3% 0.4% 0.2% B16..8: 32.1% 3.9% 1.0% direct: 5.2% skip:56.9% L0:46.0% L1:49.0% BI: 5.0% [libx264 @ 0xbd2ea8380] 8x8 transform intra:56.6% inter:79.1% [libx264 @ 0xbd2ea8380] coded y,uvDC,uvAC intra: 67.1% 76.8% 45.6% inter: 19.7% 23.1% 1.2% [libx264 @ 0xbd2ea8380] i16 v,h,dc,p: 16% 49% 6% 29% [libx264 @ 0xbd2ea8380] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 30% 23% 5% 5% 5% 6% 5% 6% [libx264 @ 0xbd2ea8380] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 55% 10% 3% 5% 4% 5% 3% 3% [libx264 @ 0xbd2ea8380] i8c dc,h,v,p: 46% 31% 14% 9% [libx264 @ 0xbd2ea8380] Weighted P-Frames: Y:11.8% UV:9.3% [libx264 @ 0xbd2ea8380] ref P L0: 57.2% 9.0% 24.4% 9.0% 0.4% [libx264 @ 0xbd2ea8380] ref B L0: 79.0% 15.2% 5.8% [libx264 @ 0xbd2ea8380] ref B L1: 93.9% 6.1% [libx264 @ 0xbd2ea8380] kb/s:7374.88 Is this "[mvk-error] VK_ERROR_OUT_OF_DEVICE_MEMORY..." error can be safely ignored or is this error harmful? Best Regards, // Toughen-roushi

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Fix your code to set the timestamps properly
by Mark Filipak 22 Nov '25

22 Nov '25

Corrections. To the developers: I will pay you to Fix your code to set the timestamps properly. $2 per minute for coaching and planning and messaging. $1 per minute for writing code. Payment in advance. Open a bank account just for this purpose. Give me the account's routing numbers. I will transfer money into the account in increments of $100. Based on trust. No preconditions. We would continue the arrangement until we don't.

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