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• avcodec/x86/vp3dsp_init : Set correct function pointer, fix crash

  30 avril 2024, par Andreas Rheinhardt

  avcodec/x86/vp3dsp_init : Set correct function pointer, fix crash
  Regression since fd172185580c1ccdcfb90bbfdb59fa806fad3117 ;
  
  triggered by vp4/KTkvw8dg1J8.avi in the FATE suite, but not
  
  when running fate as this code is not used when the bitexact
  
  flag is set.
  Bisecting done by ami_stuff, patch from user Mika Fischer
  
  in ticket #10027 (which this commit fixes).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/x86/vp3dsp_init.c

• When usg ffmpeg to convert from .mp4 to .avi, how do I get the .avi files to contain the correct (trimmed) frames from the .mp4 ?

  17 avril 2024, par cassenav

  I am using ffmpeg to convert a batch of .mp4 videos to the .avi format from the command line. The .mp4 videos are all trimmed videos that are sub-videos of a longer video. I have basically segmented the longer video into small, non-overlapping chunks (or maybe with a couple milliseconds of overlap), and I want to convert all of these smaller chunks (.mp4) to .avi. However, I am running into an issue : the .avi files all contain a some additional frames at the beginning of each video which I explicitly trimmed in the .mp4 videos. I'm not sure what exactly is causing this problem or how to solve it. I suspect that there is some inconsistency in the frame rate when converting the videos, but I could be wrong.

  


  I have tried using the following commands :

  


  for file in *.mp4; do ffmpeg  -i "$file" -acodec copy -vcodec copy "${file%.mp4}.avi"; done

  


  for file in *.mp4; do ffmpeg  -i "$file" -acodec copy -vcodec copy -fps_mode 2 "${file%.mp4}.avi"; done

  


  for file in *.mp4; do ffmpeg  -i "$file" -c:v copy -c:a copy -fps_mode 2 "${file%.mp4}.avi"; done

  


  for file in *.mp4; do ffmpeg  -i "$file" -c:v copy -c:a copy -fps_mode 1 "${file%.mp4}.avi"; done

  


  for file in *.mp4; do ffmpeg -i "$file" -c:v copy -c:a copy "${file%.mp4}.avi"; done    

  


  all to no avail. How can I solve this issue such that only the frames in the trimmed .mp4 video are processed in the resulting .avi ?

  


• FFmpeg dynamic cropping using sendcmd correct syntax ?

  19 avril 2024, par Sulli

  I'm trying to dynamically crop a video using FFmpeg's sendcmd filter based on coordinates specified in a text file, but the crop commands do not seem to be taking effect. Here's the format of the commands I've tried and the corresponding FFmpeg command I'm using.

  


  Following the documentation https://ffmpeg.org/ffmpeg-filters.html#sendcmd_002c-asendcmd, commands in the text file (coordinates.txt) like this :

  


  0.05 [enter] crop w=607:h=1080:x=0:y=0;
0.11 [enter] crop w=607:h=1080:x=0:y=0;
...


  


  Ffmpeg command :

  


  ffmpeg -i '10s.mp4' -filter_complex "[0:v]sendcmd=f=coordinates.txt" -c:v libx264 -c:a copy -r 30 output.mp4


  


  This doesn’t seem to do anything.

  


  And with the commands in the text file (coordinates.txt) like this :

  


  0.05    crop w 607, crop h 1080, crop x 0, crop y 0;
0.11    crop w 607, crop h 1080, crop x 0, crop y 0;
...


  


  Ffmpeg command :

  


  ffmpeg -i '10s.mp4' -filter_complex "[0:v]sendcmd=f=coordinates.txt,crop" -c:v libx264 -c:a copy -r 30 output.mp4


  


  (following this answer https://stackoverflow.com/a/67508233/1967110)

  


  This one does something, but something very messy. It looks like it crops at the correct x, but does not take into account the y, w or h, and it puts the crop at the right side of the input video.

  


  Edit : what I’m trying to do is create a 607x1080 (portrait format, 9:16) video from a 1920x1080 video, with the x parameter varying across time (imagine sliding horizontally a 9:16 frame over a 16:9 video). So fixed w, h and y, just x varying.

  


  I’m using this ffmpeg version :

  


  ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
configuration: --prefix=/home/ffmpeg-builder/release --pkg-config-flags=--static --extra-libs=-lm --disable-doc --disable-debug --disable-shared --disable-ffprobe --enable-static --enable-gpl --enable-version3 --enable-runtime-cpudetect --enable-avfilter --enable-filters --enable-nvenc --enable-nvdec --enable-cuvid --toolchain=hardened --disable-stripping --enable-opengl --pkgconfigdir=/home/ffmpeg-builder/release/lib/pkgconfig --extra-cflags='-I/home/ffmpeg-builder/release/include -static-libstdc++ -static-libgcc ' --extra-ldflags='-L/home/ffmpeg-builder/release/lib -fstack-protector -static-libstdc++ -static-libgcc ' --extra-cxxflags=' -static-libstdc++ -static-libgcc ' --extra-libs='-ldl -lrt -lpthread' --enable-ffnvcodec --enable-gmp --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libkvazaar --enable-libmp3lame --enable-libopus --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libshine --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtheora --enable-libvidstab --ld=g++ --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --enable-openssl --enable-zlib --enable-nonfree --extra-libs=-lpthread --enable-pthreads --extra-libs=-lgomp