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• `ffmpeg -f concat` don't work when all input streams appear to have the same spec

  2 octobre 2024, par Roy

  My ffmpeg command :

  


  ffmpeg -safe 0 -f concat -i list.txt -c copy out.mp4


  


  My 1st input file :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Applications\ffmpeg_6.0_full\a.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf60.3.100
  Duration: 00:00:04.97, start: 0.000000, bitrate: 40 kb/s
  Stream #0:0[0x1](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 2 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 27 kb/s, 30 fps, 30 tbr, 30k tbn (default)
    Metadata:
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc60.3.100 libx264


  


  My 2nd input file :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D:\Applications\ffmpeg_6.0_full\b.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp41isom
    creation_time   : 2023-03-08T06:47:13.000000Z
    artist          : Microsoft Game DVR
    title           : PUBG: BATTLEGROUNDS
  Duration: 00:10:00.16, start: 0.000000, bitrate: 20885 kb/s
  Stream #0:0[0x1](und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 20739 kb/s, 30 fps, 30 tbr, 30k tbn (default)
    Metadata:
      creation_time   : 2023-03-08T06:47:13.000000Z
      handler_name    : VideoHandler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 131 kb/s (default)
    Metadata:
      creation_time   : 2023-03-08T06:47:13.000000Z
      handler_name    : SoundHandler
      vendor_id       : [0][0][0][0]


  


  The above command outputs some warning signals :

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000025239902d40] Auto-inserting h264_mp4toannexb bitstream filter
[mp4 @ 00000252396fe5c0] Non-monotonous DTS in output stream 0:1; previous: 218112, current: 150024; changing to 218113. This may result in incorrect timestamps in the output file.
...
a lot of them
...
frame=25992 fps=21754 q=-1.0 Lsize= 1519621kB time=00:14:49.39 bitrate=13996.8kbits/s speed= 744x
video:9649kB audio:1519216kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown


  


  The resultant video can play the first part of the video correctly, then the video players either skips directly to the end of the video (MPC-HC), or don't render anything at all while timer passes as normal (VLC).

  


  My impression of the concat is that it requires all videos to have the same spec, which I think my input achieved (all the "Steam #0:0", etc, line matches). I only see the following difference, which I assumed that should be okay :

  


  

  1. Metadata are different both for the whole input (e.g. "major_brand") and for each stream (e.g. "encoder"). I assumed that metadata won't affect the processing.

  


  2. The order of video/audio streams are different in the two inputs : the 1st input file has audio then video ; the 2nd input file has video then audio. I assumed that ffmpeg knows the difference and won't concat a video stream to an audio stream.

  


  


  The full output of the command can be found in this pastebin : https://pastebin.com/Z5q97Uyg

  


• FFmpeg-command freezes app on NET MAUI Android [closed]

  28 septembre 2024, par Christian Röder

  Cheers,

  


  I'm developing a .NET MAUI app where I want to create videos from a list of images.

  


  This is the command : "-y -f concat -safe 0 -analyzeduration 100M -probesize 50M -i {Path.Combine(basePath, "input.txt")} -vf \"scale=720:1280,setsar=1:1\" -vcodec mpeg4 -pix_fmt yuv420p {outputPath}"

  


  The problem is, my app freezes when the command is executed. I've tried so much await/async/await/Task stuff, it changes nothing. The video ist created anyway...
When I'm using a simple command like "-encoders" everything is fine.

  


  This is the log when creating a video out of three images :

  


  [ffmpeg-kit] ffmpeg version n6.0
[ffmpeg-kit]  Copyright (c) 2000-2023 the FFmpeg developers
[ffmpeg-kit] 
[ffmpeg-kit]   built with Android (7155654, based on r399163b1) clang version 11.0.5 (https://android.googlesource.com/toolchain/llvm-project 87f1315dfbea7c137aa2e6d362dbb457e388158d)
[ffmpeg-kit]   configuration: --cross-prefix=aarch64-linux-android- --sysroot=/Users/sue/Library/Android/sdk/ndk/22.1.7171670/toolchains/llvm/prebuilt/darwin-x86_64/sysroot --prefix=/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/ffmpeg --pkg-config=/opt/homebrew/bin/pkg-config --enable-version3 --arch=aarch64 --cpu=armv8-a --target-os=android --enable-neon --enable-asm --enable-inline-asm --ar=aarch64-linux-android-ar --cc=aarch64-linux-android24-clang --cxx=aarch64-linux-android24-clang++ --ranlib=aarch64-linux-android-ranlib --strip=aarch64-linux-android-strip --nm=aarch64-linux-android-nm --extra-libs='-L/Users/sue/Projects/arthenica/ffmpeg-kit/prebuilt/android-arm64/cpu-features/lib -lndk_compat' --disable-autodetect --enable-cross-compile --enable-pic --enable-jni --enable-optimizations --enable-swscale --disable-static --enable-shared --enable-pthreads --enable-v4l2-m2m --disable-outdev=fbdev --disable-indev=fbdev --enable-small --disable-xmm-clobber-test --disable-debug --enable-lto --disable-neon-clobber-test --disable-programs --disable-postproc --disable-doc --disable-htmlpages --disable-manpages --disable-podpages --disable-txtpages --disable-sndio --disable-schannel --disable-securetransport --disable-xlib --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --disable-videotoolbox --disable-audiotoolbox --disable-appkit --disable-alsa --disable-cuda --disable-cuvid --disable-nvenc --disable-vaapi --disable-vdpau --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-gmp --enable-gnutls --enable-libmp3lame --enable-libass --enable-iconv --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libxml2 --enable-libopencore-amrnb --enable-libshine --enable-libspeex --enable-libdav1d --enable-libkvazaar --enable-libilbc --enable-libopus --enable-libsnappy --enable-libsoxr --enable-libtwolame --disable-sdl2 --enable-libvo-amrwbenc --enable-libzimg --disable-openssl --enable-zlib --enable-mediacodec
[ffmpeg-kit]   libavutil      58.  2.100 / 58.  2.100
[ffmpeg-kit]   libavcodec     60.  3.100 / 60.  3.100
[ffmpeg-kit]   libavformat    60.  3.100 / 60.  3.100
[ffmpeg-kit]   libavdevice    60.  1.100 / 60.  1.100
[ffmpeg-kit]   libavfilter     9.  3.100 /  9.  3.100
[ffmpeg-kit]   libswscale      7.  1.100 /  7.  1.100
[ffmpeg-kit]   libswresample   4. 10.100 /  4. 10.100
[ffmpeg-kit] Input #0, concat, from '/data/user/0/com.companyname.myapp/cache/input.txt':
[ffmpeg-kit]   Duration: 
[ffmpeg-kit] 00:00:01.50
[ffmpeg-kit] , start: 
[ffmpeg-kit] 0.000000
[ffmpeg-kit] , bitrate: 
[ffmpeg-kit] 1 kb/s
[ffmpeg-kit] 
[ffmpeg-kit]   Stream #0:0
[ffmpeg-kit] : Video: png, rgba(pc), 1080x1970
[ffmpeg-kit] , 
[ffmpeg-kit] 25 fps, 
[ffmpeg-kit] 25 tbr, 
[ffmpeg-kit] 25 tbn
[ffmpeg-kit] 
[ffmpeg-kit] Stream mapping:
[ffmpeg-kit]   Stream #0:0 -> #0:0
[ffmpeg-kit]  (png (native) -> mpeg4 (native))
[ffmpeg-kit] 
[ffmpeg-kit] Press [q] to stop, [?] for help
[ffmpeg-kit] Output #0, mp4, to '/data/user/0/com.companyname.myapp/cache/myapp.mp4':
[ffmpeg-kit]   Metadata:
[ffmpeg-kit]     encoder         : 
[ffmpeg-kit] Lavf60.3.100
[ffmpeg-kit] 
[ffmpeg-kit]   Stream #0:0
[ffmpeg-kit] : Video: mpeg4 (mp4v / 0x7634706D), yuv420p(tv, unknown/bt709/iec61966-2-1, progressive), 720x1280 [SAR 1:1 DAR 9:16], q=2-31, 200 kb/s
[ffmpeg-kit] , 
[ffmpeg-kit] 25 fps, 
[ffmpeg-kit] 12800 tbn
[ffmpeg-kit] 
[ffmpeg-kit]     Metadata:
[ffmpeg-kit]       encoder         : 
[ffmpeg-kit] Lavc60.3.100 mpeg4
[ffmpeg-kit] 
[ffmpeg-kit]     Side data:
[ffmpeg-kit]       
[ffmpeg-kit] cpb: 
[ffmpeg-kit] bitrate max/min/avg: 0/0/200000 buffer size: 0 
[ffmpeg-kit] vbv_delay: N/A
[ffmpeg-kit] 
[ffmpeg-kit] frame=    0 fps=0.0 q=4.1 size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
[ffmpeg-kit] frame=   36 fps=0.0 q=2.7 Lsize=     268kB time=00:00:01.40 bitrate=1568.3kbits/s dup=33 drop=0 speed=7.18x    
[ffmpeg-kit] video:267kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 
[ffmpeg-kit] 0.382941%
[ffmpeg-kit] 


  


  I've putting the execute command in many different ways like Task.Run(() => ffmpegService.Execute(encoderCommand));

  


• How can I remove every nth frame from raw video using ffmpeg ?

  15 juin 2024, par DaveB44

  Question moved to SuperUser, please reply there

  


  I have many cine films that have been digitally converted. They have been converted as a 25 fps with 2 frames in every 23 duplicated. I need to remove the duplicated frames using a bitstream filter so there is no decoding/encoding.

  


  After removing the frames I will change to the original cine frame rate of 18 fps. I will then change the frame rate to 25 fps using duplicated frames. I don't want to interpolate as I want to preserve the jerky format of the cine. Finally I will video editing software that will do the final encoding.

  


  All the additional steps will cause several stages of decoding/encoding, that I need to avoid.

  


  First I used a combination of the answers to FFmpeg remove video frames at specific intervals and FFmpeg remove every 6th frame starting from the 3rd frame, on an mp4 file to check it works. I modified it to remove every 4th and 17th frame in 25.

  


  ffmpeg -loglevel warning -i cine.mp4 -an -vf "select='if((mod(n-4,25)),(mod(n-17,25)))',setpts='N/FRAME_RATE/TB'" cine-23.mp4


  


  This works fine, but I end up with a file a quarter the size.

  


  I now used Gyan's answer in Using ffmpeg to change framerate to extract the raw bitstream.

  


  ffmpeg -loglevel warning -i cine.mp4 -c copy -f h264 cine.h264


  


  This created the h264 file as expected, surprisingly it was 16 kB smaller than the original (67 GB file size).

  


  I then modified the code to use the .h264 file.

  


  ffmpeg -loglevel warning -i cine.h264 -vf "select='if((mod(n-4,25)),(mod(n-17,25)))',setpts='N/FRAME_RATE/TB'" cine-23.h264


  


  This gave the following error, but created the cine-23.h264 file although it was the same size as cine-23.mp4 in the test above

  


  [h264 @ 00000245ec0bfb80] non-existing SPS 0 referenced in buffering period
    Last message repeated 1 times


  


  I then checked the ffmpeg bitstream filter documentation and found the bitstream filter setts. I changed my code to the following.

  


  ffmpeg -loglevel warning -i cine.h264 -bsf:v "select='if((mod(n-4,25)),(mod(n-17,25)))',setts=pts='N/FRAME_RATE/TB'" cine-23.h264


  


  Which resulted in the following error.

  


  [vost#0:0/libx264 @ 000002916cf173c0] Error parsing bitstream filter sequence 'select='if((mod(n-4,25)),(mod(n-17,25)))',setts=pts='N/FRAME_RATE/TB'': Bitstream filter not found
Error opening output file cine-23.h264.
Error opening output files: Bitstream filter not found


  


  I'm assuming the error is because setts does not support select. Is there another way to achieve what I am looking for ?

  


  I could use mpdecimate but as that has to compare each frame it is much slower than defining it only needs to delete frames 4 and 17 in every second.

  


  This is the output of ffprobe on my original file.

  


  ffprobe version 2023-11-28-git-47e214245b-full_build-www.gyan.dev Copyright (c) 2007-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --pkg-config=pkgconf --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-dxva2 --enable-d3d11va --enable-libvpl --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint
  libavutil      58. 32.100 / 58. 32.100
  libavcodec     60. 35.100 / 60. 35.100
  libavformat    60. 18.100 / 60. 18.100
  libavdevice    60.  4.100 / 60.  4.100
  libavfilter     9. 14.100 /  9. 14.100
  libswscale      7.  6.100 /  7.  6.100
  libswresample   4. 13.100 /  4. 13.100
  libpostproc    57.  4.100 / 57.  4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'cine.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 19529864
    compatible_brands: mp42isom
    creation_time   : 2024-02-19T21:01:10.000000Z
  Duration: 00:01:00.00, start: 0.000000, bitrate: 9245 kb/s
  Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 720x576 [SAR 35:32 DAR 175:128], 9243 kb/s, 25 fps, 25 tbr, 25 tbn (default)
    Metadata:
      creation_time   : 2024-02-19T21:01:10.000000Z
      handler_name    : Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding