February 2020 - ffmpeg-user - lists.ffmpeg.org

Concat filter with more than 1 audio stream -- How?
by Mark Filipak 25 Feb '20

25 Feb '20

Here: https://trac.ffmpeg.org/wiki/Concatenate I see this: ffmpeg -i "concat:input1.ts|input2.ts|input3.ts" -c copy output.ts so I tried it! WHAT WORKED: ffmpeg -i "concat:i:\VIDEO_TS\VTS_02_1.VOB|i:\VIDEO_TS\VTS_02_2.VOB|i:\VIDEO_TS\VTS_02_3.VOB|i:\VIDEO_TS\VTS_02_4.VOB|i:\VIDEO_TS\VTS_02_5.VOB" -c copy n:\output.ts But there's only 1 audio stream. According to this: https://ffmpeg.org/ffmpeg-filters.html#concat I need to specify options 'n' 'v' & 'a'. But the examples don't look anything like WHAT WORKED. How do I integrate 'n' 'v' & 'a' into WHAT WORKED? Warm Regards, Mark.

5 15

No response from trac.ffmpeg.org
by Mark Filipak 25 Feb '20

25 Feb '20

Sorry for the interruption but I have no choice. Can anyone contact the folks at trac.ffmpeg.org? I'm trying to register, but I get no confirmation email -- I've tried 4 times. There's no way I can contact them for help because, 1, there's no 'contact' link, 2, "Help/Guide" is entirely passive & static, and 3, there may be other ways but, in their words: "permissions have been limited until you verify your email address." Thanks, Mark.

3 9

Difference between videos with libx264 and h264_nvenc
by Totte Karlsson 24 Feb '20

24 Feb '20

When using the libx264 encoder on 8bit raw input, the resulting video shows up slightly darker than the original. Using this command: ffmpeg.exe -y -hide_banner -vcodec rawvideo -f rawvideo -r 60 -s 658x492 -i \\.\pipe\DEV_000F315B978C<file://./pipe/DEV_000F315B978C> -pix_fmt gray -c:v libx264 -crf 23 X:\Videos\One_2020T115817.avi When running the compression using nvidias encoder, h264_nvenc, the darkening of the video does not occur. Using this command: ffmpeg.exe -y -hide_banner -vcodec rawvideo -f rawvideo -hwaccel nvdec -r 60 -s 658x492 -i \\.\pipe\DEV_000F315B978C -pix_fmt gray -c:v h264_nvenc -crf 23 X:\Videos\One_2020T120806.avi Is this known behavior? Any reason for the difference in the resulting video? Totte Karlsson - totte.karlsson(a)alleninstitute.org<mailto:totte.karlsson@alleninstitute.org> Senior Software Engineer - MPE 210B-35

2 1

rounding errors in v360 filter
by Michael Koch 24 Feb '20

24 Feb '20

Hi, there seem to be some rounding (or +-1) errors in the v360 filter, when converting from double fisheye to equirectangular. Can be reproduced as follows: ffmpeg -f lavfi -i color=red:size=40x40 -f lavfi -i color=green:size=40x40 -lavfi "[0][1]hstack,v360=input=dfisheye:output=e" -frames 1 -y out.png Please have a look at the output image and you will see what I mean. FFmpeg version is 3 days old. Michael

2 3

mergeing two matroska/webm files
by tuxic＠posteo.de 23 Feb '20

23 Feb '20

Hi, I have two video files created by blender, which ffprobe has identified as shown below (showing only one file...the other is technically the same) The first was an animation, which I had to stop before it was completed, the second starts, where the first ends - frame-wise How can I merge both together? Thanks a lot for any help! Cheers! mcc This is what ffprobe shows: ffprobe version 4.2.2 Copyright (c) 2007-2019 the FFmpeg developers built with gcc 9.2.0 (Gentoo 9.2.0-r3 p4) configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --docdir=/usr/share/doc/ffmpeg-4.2.2/html --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-march=native -O -pipe' --disable-static --enable-avfilter --enable-avresample --disable-stripping --disable-optimizations --disable-libcelt --disable-indev=oss --disable-outdev=oss --enable-bzlib --disable-runtime-cpudetect --disable-debug --disable-gcrypt --disable-gnutls --disable-gmp --enable-gpl --disable-hardcoded-tables --enable-iconv --disable-libtls --disable-libxml2 --disable-lzma --enable-network --disable-opencl --disable-openssl --enable-postproc --disable-libsmbclient --enable-ffplay --enable-sdl2 --disable-vaapi --disable-vdpau --enable-xlib --enable-libxcb --enable-libxcb-shm --enable-libxcb-xfixes --enable-zlib --disable-libcdio --disable-libiec61883 --disable-libdc1394 --disable-libcaca --disable-openal --disable-opengl --disable-libv4l2 --disable-libpulse --disable-libdrm --enable-libjack --disable-libopencore-amrwb --disable-libopencore-amrnb --disable-libcodec2 --disable-libdav1d --disable-libfdk-aac --enable-libopenjpeg --disable-libbluray --disable-libgme --disable-libgsm --disable-libaribb24 --disable-mmal --disable-libmodplug --disable-libopus --disable-libilbc --disable-librtmp --disable-libssh --disable-libspeex --disable-libsrt --disable-librsvg --enable-ffnvcodec --enable-libvorbis --disable-libvpx --disable-libzvbi --disable-appkit --disable-libbs2b --disable-chromaprint --disable-cuda-llvm --disable-libflite --disable-frei0r --disable-libfribidi --disable-fontconfig --disable-ladspa --disable-libass --disable-libtesseract --disable-lv2 --disable-libfreetype --disable-libvidstab --disable-librubberband --disable-libzmq --disable-libzimg --disable-libsoxr --enable-pthreads --disable-libvo-amrwbenc --enable-libmp3lame --disable-libkvazaar --disable-libaom --disable-libopenh264 --disable-libsnappy --disable-libtheora --disable-libtwolame --disable-libwavpack --disable-libwebp --enable-libx264 --enable-libx265 --disable-libxvid --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-neon --disable-vfp --disable-vfpv3 --disable-armv8 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-altivec --disable-aesni --disable-avx --disable-avx2 --disable-fma3 --disable-fma4 --disable-sse3 --disable-ssse3 --disable-sse4 --disable-sse42 --disable-xop --cpu=host --disable-doc --disable-htmlpages --enable-manpages libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavdevice 58. 8.100 / 58. 8.100 libavfilter 7. 57.100 / 7. 57.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 libpostproc 55. 5.100 / 55. 5.100 Input #0, matroska,webm, from '0001-1995.mkv': Metadata: SCENE : Scene ENCODER : Lavf58.12.100 Duration: 00:01:03.71, start: 0.000000, bitrate: 2671 kb/s Stream #0:0: Video: h264 (High), yuv420p(progressive), 1200x1200 [SAR 1:1 DAR 1:1], 24 fps, 24 tbr, 1k tbn, 48 tbc (default) Metadata: DURATION : 00:01:03.709000000

2 1

Sending Data Allow With Video From a MPEGTS stream
by Tim McClure 23 Feb '20

23 Feb '20

ffmpeg -re -i IndagoLE.ts -codec copy -f mpegts udp:// 192.168.1.134:5047?pkt_size=1316 The ts file I am using above has KLV along with video. I am trying to send the stream to a UDP port with both channels being present however only the video channel is being sent. I basically want to pass the mpegts stream through - does anyone know how to do this? Tim

3 2

silenceremove use
by To ny 22 Feb '20

22 Feb '20

Hello good people of the ffmpeg-users list, Because i'm not allowed to say anything in the #ffmpeg irc channel. Weird "cannot send to nick/channel" error message appears and thought i'd try the mailing list. Is there anyone who has experience with the silenceremove filter? I'm trying to remove long silences from recordings i made on my phone. The silences are actually a constant noise because of the microphone gain is set to 5.0x. (The playback meter in Audacity says the noise is around -48 to 42 dB). It is around 9 hours in duration. 1,1 GB large, signed 16 bit little endian mono 16 kHz wave file. Audacity says it's 32 bit float wave file though. To make sure that something is removed (or almost everything) i (hopefully) set the right silenceremove arguments to -20 db. # ffmpeg -i '/home/tony/test/Recording_53.wav' -af silenceremove=1:0:-20dB recording53_silences_removed.wav # Removes almost nothing. File almost as large as original. # Runs at incredible speed with e in the speed readout. # Done is a few minutes. # ffmpeg -i '/home/tony/test/Recording_53.wav' -af silenceremove=0:0:0:0:0:-1:0:-20dB:0:0:1:0 recording53_silences_removed.wav # Runs at 4.5x speed (takes long, like 1:30 hours) # leaves file of 500 MB and 4:30 hours in duration # still has silences of same level of several seconds, sometimes a minute. #ffmpeg -i '/home/tony/test/Recording_53.wav' -af silenceremove=start_periods=1:start_duration=0:start_threshold=-20dB:start_silence=3:star$ # Done in 40 seconds # leaves an empty file Does anyone know the right set of arguments for the silenceremove filter? Thanks a bunch.

3 17

Low quality when using GPU (h264_videotoolbox) to create mp4s
by MediaMouth 22 Feb '20

22 Feb '20

For some reason ffmpeg code I've been using successfully seems to no longer work (or I somehow I accidentally changed something and didn't realize it) The results of using the command below produces very low quality results. The same command run w/o h264_videotoolbox works fine, albeit considerably slower. The stdout seems to suggest the issue is -crf vs a constant bitrate.. Codec AVOption crf (Select the quality for constant quality mode) specified for output file #0 ([DestPath]) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream. but I've definitely used -crf in the past with h264_videotoolbox without an issue. Thanks in advance. Command: ffmpeg -i [SrcPath] -vcodec h264_videotoolbox -crf 18 -vf format=yuv420p [DestPath] Output: ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers built with Apple clang version 11.0.0 (clang-1100.0.33.17) configuration: --prefix=/usr/local/Cellar/ffmpeg/4.2.2_2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librubberband --enable-libsnappy --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-videotoolbox --disable-libjack --disable-indev=jack libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavdevice 58. 8.100 / 58. 8.100 libavfilter 7. 57.100 / 7. 57.100 libavresample 4. 0. 0 / 4. 0. 0 libswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 libpostproc 55. 5.100 / 55. 5.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '[SrcPath]': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf58.29.100 Duration: 00:05:38.64, start: 0.000000, bitrate: 66306 kb/s Stream #0:0(eng): Video: prores (HQ) (apch / 0x68637061), yuv422p10le(tv, bt470bg/unknown/unknown, progressive), 720x486, 64765 kb/s, 29.97 fps, 29.97 tbr, 11988 tbn, 11988 tbc (default) Metadata: handler_name : Apple Video Media Handler encoder : Lavc58.54.100 prores_ks Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s16, 1536 kb/s (default) Metadata: handler_name : Apple Sound Media Handler Codec AVOption crf (Select the quality for constant quality mode) specified for output file #0 ([DestPath]) has not been used for any stream. The most likely reason is either wrong type (e.g. a video option with no video streams) or that it is a private option of some encoder which was not actually used for any stream. Stream mapping: Stream #0:0 -> #0:0 (prores (native) -> h264 (h264_videotoolbox)) Stream #0:1 -> #0:1 (pcm_s16be (native) -> aac (native)) Press [q] to stop, [?] for help Output #0, mp4, to '[DestPath]': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf58.29.100 Stream #0:0(eng): Video: h264 (h264_videotoolbox) (avc1 / 0x31637661), yuv420p, 720x486, q=2-31, 200 kb/s, 29.97 fps, 11988 tbn, 29.97 tbc (default) Metadata: handler_name : Apple Video Media Handler encoder : Lavc58.54.100 h264_videotoolbox Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default) Metadata: handler_name : Apple Sound Media Handler encoder : Lavc58.54.100 aac

2 2

Unexpected aac audio duration
by naraimo＠libero.it 21 Feb '20

21 Feb '20

Hi all, I'm trying to encode audio with ffmpeg aac encoder. An example with brown noise input follows: ffmpeg -f lavfi -i anoisesrc=c=brown:a=0.05:d=1:r=8000:n=1024 -t 0.560 -ac 8000 -codec aac -b:a 16k -f adts out.aac The result is shown below: ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers built with gcc 7 (Ubuntu 7.3.0-16ubuntu3) configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared libavutil 55. 78.100 / 55. 78.100 libavcodec 57.107.100 / 57.107.100 libavformat 57. 83.100 / 57. 83.100 libavdevice 57. 10.100 / 57. 10.100 libavfilter 6.107.100 / 6.107.100 libavresample 3. 7. 0 / 3. 7. 0 libswscale 4. 8.100 / 4. 8.100 libswresample 2. 9.100 / 2. 9.100 libpostproc 54. 7.100 / 54. 7.100 Input #0, lavfi, from 'anoisesrc=c=brown:a=0.05:d=1:r=8000:n=1024': Duration: N/A, start: 0.000000, bitrate: 512 kb/s Stream #0:0: Audio: pcm_f64le, 8000 Hz, mono, dbl, 512 kb/s Stream mapping: Stream #0:0 -> #0:0 (pcm_f64le (native) -> aac (native)) Press [q] to stop, [?] for help Output #0, adts, to 'out.aac': Metadata: encoder : Lavf57.83.100 Stream #0:0: Audio: aac (LC), 8000 Hz, mono, fltp, 16 kb/s Metadata: encoder : Lavc57.107.100 aac size= 1kB time=00:00:00.64 bitrate= 18.7kbits/s speed=76.3x video:0kB audio:1kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.892562% [aac @ 0x5563feb38820] Qavg: 11006.257 Due to the aac frames size (1024) and 8KHz sample rate the duration of each aac frame is 1024/8000 = 0.128 seconds. The required duration (-t 0.56) cannot be divided by 0.128 so it is correctly rounded to the nearest frame (5*0.128 = 0.64). The result, as reported by ffmpeg "time=00:00:00.64", should have a duration of 0.64 seconds. But if I decode the aac to raw pcm I get a different duration: ffmpeg -i out.aac -c pcm_s16le -f s16le out_aac.raw [...] Output #0, s16le, to 'out_aac.raw': Metadata: encoder : Lavf57.83.100 Stream #0:0: Audio: pcm_s16le, 8000 Hz, mono, s16, 128 kb/s Metadata: encoder : Lavc57.107.100 pcm_s16le size= 12kB time=00:00:00.76 bitrate= 128.0kbits/s speed=1.26e+03x video:0kB audio:12kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000% It seems that an aac frame has been added to the output (6*0.128 = 0.768). I have also checked the file size (12288 byte). This means 6144 samples. With 8KHz the duration is 6144 / 8000 = 0.768 seconds. I have noticed the same behaviour with longer durations, without the anoisesrc source (file input) and also with muxer (e.g. HLS) based on aac encoder. Below an example based on previously generated out.aac file (0.768 seconds) and HLS muxer: ffmpeg -i out.aac -b:a 16k -hls_time 1.2 -hls_list_size 0 -hls_segment_type mpegts out.m3u8 [...] Output #0, hls, to 'out.m3u8': Metadata: encoder : Lavf57.83.100 Stream #0:0: Audio: aac (LC), 8000 Hz, mono, fltp, 16 kb/s Metadata: encoder : Lavc57.107.100 aac [hls @ 0x55f0b7d84840] Opening 'out.m3u8.tmp' for writing size=N/A time=00:00:00.76 bitrate=N/A speed= 113x video:0kB audio:3kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [aac @ 0x55f0b7d837c0] Qavg: 19275.893 The input samples count is divisible by 1024. However, the output duration is increased of another frame (7*0.128 = 0.896) as shown by the m3u8 file: #EXTM3U #EXT-X-VERSION:3 #EXT-X-TARGETDURATION:1 #EXT-X-MEDIA-SEQUENCE:0 #EXTINF:0.896000, out0.ts #EXT-X-ENDLIST I would like to ask if this the expected behaviour of aac encoder. And if so, is it possible to get an output with the correct duration (eventually rounded to the first aac frame)? Thanks for any help, Nadir

2 2

ffplay.exe prevents monitor standby in Windows
by Mark Butler 21 Feb '20

21 Feb '20

I have a security camera rtsp feed continuously streaming via ffplay.exe in Windows. As I understand it, ffplay disables SDL_VIDEO_ALLOW_SCREENSAVER in order to prevent standby/sleep. Is there a way to turn this default behavior off so that the monitor can go to standby after the user set period of time?

2 2