November 2024 - ffmpeg-user - lists.ffmpeg.org

Problem rewrapping DV in MOV
by Ganesh.Irelan＠syda.org 05 Nov '24

05 Nov '24

Hello I have .dv files captured from DV videotapes with vrecord. The .dv files play fine in Quicktime Player 10 but are not supported by Premier Pro or FCP. I want to wrap the DV stream from the .dv files into Quicktime MOV (without transcoding) so they can be imported into Premier Pro. FFMPEG rewraps the stream but when played in Quicktime, VLC, and Premier Pro there are narrow black vertical bars on the left and right edges of the frame. It looks like the production aperture 720x480 is being displayed instead of the clean aperture 704x480 but that’s just a guess. Can someone tell me an FFMPEG command that will result in MOV wrapped DV that displays without the vertical borders? This is what I tried. 3137-Mac-Pro-DAM:~ kirelan$ ffmpeg -i 36058.dv -map 0 -c copy 36058_Rewrap.mov ffmpeg version 6.1.1-tessus https://evermeet.cx/ffmpeg/ Copyright (c) 2000-2023 the FFmpeg developers built with Apple clang version 11.0.0 (clang-1100.0.33.17) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay 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 [dv @ 0x7fbee8d06b80] Detected timecode is invalid [dv @ 0x7fbee8d06b80] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from '36058_PRM.dv': Duration: 00:39:07.91, start: 0.000000, bitrate: 28771 kb/s Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 8:9 DAR 4:3], 28771 kb/s, 60k fps, 29.97 tbr, 60k tbn Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s Output #0, mov, to '36058_Rewrap_Map.mov': Metadata: encoder : Lavf60.16.100 Stream #0:0: Video: dvvideo (dvcp / 0x70637664), yuv411p, 720x480 [SAR 8:9 DAR 4:3], q=2-31, 28771 kb/s, 60k fps, 29.97 tbr, 60k tbn Stream #0:1: Audio: pcm_s16le (sowt / 0x74776F73), 48000 Hz, stereo, s16, 1536 kb/s Stream mapping: Stream #0:0 -> #0:0 (copy) Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help [out#0/mov @ 0x7fbee8d0b940] video:8246133kB audio:439852kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.017190% size= 8687478kB time=00:39:07.87 bitrate=30311.5kbits/s speed=14.8x Thank you

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Building ffmpeg with vulkan support in docker container.
by Mattias Werdenskog 04 Nov '24

04 Nov '24

Hello, Attempting to build ffmpeg that has vulkan support enabled in a docker container. The container environment is ubuntu 24.04 with installed packages libvulkan-dev, (libvulkan1), vulkan-icd, vulkan-tools. As far as I understand vulkan is supposed to be autodetected by ffmpeg configure (but does not enable by itself) and when trying to pass `--enable-vulkan`, configure will exit error “ERROR: vulkan requested but not found”. I have confirmed vulkan is able to detect hardware gpu when the container is running, but hardware access a bit more limited while building (from Dockerfile). Don’t know whether detected gpu hardware in vulkan matters at build time, but as the vulkan-icd package is installed some software/cpu support should at least be enabled. VK_HEADER_VERSION 275 Ffmpeg 7.1 Any pointers where to look to get this working? Thanks.

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Expected latency with RTSP/TCP H264 stream
by Clément Péron 03 Nov '24

03 Nov '24

Hello, I'm trying to have a low latency stream if possible, less than 500ms. By "latency" I mean the delta between a frame is sent by the camera and when it's received and decoded by FFMpeg until being available to the stdout. To measure it, I add an overlay from the camera side with the source timestamp And I then add a timestamp on the ffmpeg side using the drawtext plugin and output it as a BMP. My measurement show: 1080p: 616ms 4k: 699ms I use the Cuvid decoder with the following command: ./ffmpeg -allowed_media_types video -c:v h264_cuvid -err_detect careful -fflags nobuffer -init_hw_device cuda:0 -max_port 65000 -min_port 5000 -nostats -re -rtsp_flags prefer_tcp -rtsp_transport tcp -surfaces 8 -timeout 1000000 -i rtsp://root:XXX@10.98.5.107:554/axis-media/media.amp -vf "drawtext=text='%{localtime\:%Y/%m/%d %H\\\\\:%M\\\\\:%S.%N}': x=0: y=50: fontcolor=white: fontsize=48: box=1: boxcolor=black(a)0.5" -pix_fmt rgb24 -vframes 1 output_image_X.bmp Do you think reducing the latency to less than 500ms is doable? Or is there some kind of limitation in the pipeline somewhere? Thanks for your help

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Can't generate an .xml file
by Aditya Dandavate 02 Nov '24

02 Nov '24

ffmpeg -i distorted.mp4 -i original.mp4 -filter_complex libvmaf -f null - This command doesn't ouput any .xml file. How to tweak this command to get an .xml file ?

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Can this trigger VBR encoding for x264, x265, and libvvenc ?
by Aditya Dandavate 01 Nov '24

01 Nov '24

If I set " -b:v 5000k -maxrate 6000k -minrate 4000k " for x264, x265 and vvenc, will this enable VBR encoding for these three encoders ?

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