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• Lost video when converting from MKV to MP4 with FFMPEG

  25 décembre 2022, par Francesco Virga

  I'm trying to come up with a robust script to handle all MKV -> MP4 video conversions.

  


  The classic example I've found is ffmpeg -i input.mkv -codec copy output.mp4. This works for most videos, but I find that the video stream gets lost for certain videos. Using -map 0 doesn't help, the examples I'm using only have one video stream and one audio stream.

  


  If I only copy the audio codec, it seems to work fine, but takes much longer since video is re-encoded. For this I'm use ffmpeg -i input.mkv -c:a copy output.mp4. I'm fine to use this for certain videos, but am not sure how to determine whether video re-encoding is needed or not (since I want to avoid it when possible).

  


  Here's the output I get when I run the first command and lose video :

  


  % ffmpeg -i input.mkv -codec copy output.mp4

ffmpeg version N-103075-g4c694093be-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2021 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-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay
  libavutil      57.  2.100 / 57.  2.100
  libavcodec     59.  3.102 / 59.  3.102
  libavformat    59.  4.101 / 59.  4.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  1.103 /  8.  1.103
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    CREATION_TIME   :
    ENCODER         : Lavf55.12.0
  Duration: 00:59:15.97, start: 0.062000, bitrate: 1892 kb/s
  Stream #0:0: Video: hevc (Main), yuv420p(tv, bt709), 1912x1072 [SAR 1:1 DAR 239:134], 23.98 fps, 23.98 tbr, 1k tbn (default)
  Stream #0:1(eng): Audio: aac (LC), 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : Surround
      LANGUAGE        : eng
  Stream #0:2(eng): Subtitle: ass (default)
  Stream #0:3(eng): Subtitle: ass
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf59.4.101
  Stream #0:0: Video: hevc (Main) (hev1 / 0x31766568), yuv420p(tv, bt709), 1912x1072 [SAR 1:1 DAR 239:134], q=2-31, 23.98 fps, 23.98 tbr, 16k tbn (default)
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 5.1, fltp (default)
    Metadata:
      title           : Surround
      LANGUAGE        : eng
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=32634 fps=0.0 q=-1.0 size=  295424kB time=00:22:41.04 bitrate=1778.1kbits/s speed=2.72e+03x frame=63776 fps=63775 q=-1.0 size=  611840kB time=00:44:19.94 bitrate=1884.3kbits/s speed=2.66e+03frame=85256 fps=62686 q=-1.0 Lsize=  822207kB time=00:59:15.83 bitrate=1894.2kbits/s speed=2.61e+03x
video:736136kB audio:83404kB subtitle:0kB other streams:0kB global headers:1kB muxing overhead: 0.325361%


  


• G.I. Joe Custom Multimedia

  30 mars 2012, par Multimedia Mike — General

  I received this 3-disc set of G.I. Joe CD-ROMs today :

  
  
  

  Copyright 2003, and labeled as PC ONLY. Each disc claims to have 2 episodes. So are these some sort of video discs ? Any gaming elements ? I dove in to investigate.

  So, it turns out that there are some games on these discs, done in Flash Player (which tells me that these were probably available on the web at some point). Here’s a shooting gallery game from the first disc :

  
  
  

  As promised by the CD-ROM copy, the menu does grant access to 2 classic G.I. Joe episodes. Selecting either one launches this :

  
  
  

  Powered by C-ezy ? Am I interpreting that correctly ? Anyway, the video player goes fullscreen and looks fine (given the source material). I can’t capture screenshots and controls are limited to : space for pause, ESC to exit player, and up/down to control volume. No seeking and certainly no onscreen controls. Pretty awful player.

  Studying the first disc, I find a 550 MB file with the name 5859Hasbro.egm. Coupled with ep58.cfg and ep59.cfg files in the same directory, I gather that the disc has G.I. Joe episodes 58 and 59 (though the exact episodes, “There’s No Place Like Springfield” parts 1 and 2, are listed on Wikipedia as being episodes 154 and 155 ; but who’s counting ?). The cfg files contain this text :

  ep58.cfg :
  EGM_GIJOE.exe
  5859Hasbro.egm /noend /track:0 /singletrack
  ep59.cfg :
  
  EGM_GIJOE.exe
  
  5859Hasbro.egm /noend /track:1 /singletrack
  

  The big EGM file starts with the string “Egenie Player”. After that, I see absolutely no clues. The supporting EGM_GIJOE.exe file has some interesting strings : “Decore Bits Per Pixel” (I know I have seen “Decore” used to mean “decoding core” in some libraries), “Egenie Player – %s, Version :%s”, “4th June 2002″, a list of common FourCC tags seen in AVI files, “Brought to you by Martin, Patrick Bob and Bren” (do you suppose “Patrick Bob” is one person’s name ?), a list of command line options…

  Aha ! A URL : http:\www.e-genie.tv (yep, backslashes, not forward slashes). e-genie.tv seems to redirect to mygenie.tv, which… doesn’t appear to be strictly related to video technology these days.

• How can I convert a video raw frame to image using ffmpeg [closed]

  8 mai 2024, par Sean

  I have a video stream (from a DJI Drone) coming to a websocket server.The websocket server saves the data using the technique described in this answer.

  


  Technical Details

  


  ---

  


  The frame is :

  


  

  • From a H265 video generated by the drone

  


  • has size : height 1080 , width 1440

  


  • FPS : 30

  


  • Size : 45235

  


  


  This is the raw video data as we receive from the getData() function of the video frame returned by the addStreamDataListener method

  


  Goal

  


  ---

  


  I want that the saved frame (I have noted the peculiar size) to be converted to ffpmeg.

  


  Attempt(s) to solve

  


  ---

  


  I have tried :

  


  ffmpeg -f rawvideo -s 720x480 -i images/fileName1715180324575.dat output.jpg


  


  as well as

  


  ffmpeg -f rawvideo -pix_fmt rgb24 -s 1080x1440 -i images/fileName1715180324575.dat output.jpg


  


  and various other combinations

  


  Error

  


  ---

  


  I get :

  


  ffmpeg version n6.1.1 Copyright (c) 2000-2023 the FFmpeg developers


built with gcc 13.2.1 (GCC) 20230801
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
  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
[rawvideo @ 0x5d0fc4e5f600] Packet corrupt (stream = 0, dts = 0).
[rawvideo @ 0x5d0fc4e5f600] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from 'images/fileName1715180324575.dat':
  Duration: N/A, start: 0.000000, bitrate: 933120 kb/s
  Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 1080x1440, 933120 kb/s, 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[in#0/rawvideo @ 0x5d0fc4e5f500] corrupt input packet in stream 0
[rawvideo @ 0x5d0fc4e697c0] Invalid buffer size, packet size 45235 < expected frame_size 4665600
[vist#0:0/rawvideo @ 0x5d0fc4e69640] Error submitting packet to decoder: Invalid argument
[swscaler @ 0x5d0fc4e86580] deprecated pixel format used, make sure you did set range correctly
[vost#0:0/mjpeg @ 0x5d0fc4e6c6c0] No filtered frames for output stream, trying to initialize anyway.
Output #0, image2, to 'output.jpg':
  Metadata:
    encoder         : Lavf60.16.100
  Stream #0:0: Video: mjpeg, yuvj444p(pc, progressive), 1080x1440, q=2-31, 200 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc60.31.102 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
[vist#0:0/rawvideo @ 0x5d0fc4e69640] Decode error rate 1 exceeds maximum 0.666667
[out#0/image2 @ 0x5d0fc4e69380] video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[out#0/image2 @ 0x5d0fc4e69380] Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used)
frame=    0 fps=0.0 q=0.0 Lsize=N/A time=N/A bitrate=N/A speed=N/A    
Conversion failed!


  


  or

  


  ffmpeg version n6.1.1 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 13.2.1 (GCC) 20230801
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-amf --enable-avisynth --enable-cuda-llvm --enable-lto --enable-fontconfig --enable-frei0r --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libharfbuzz --enable-libiec61883 --enable-libjack --enable-libjxl --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libplacebo --enable-libpulse --enable-librav1e --enable-librsvg --enable-librubberband --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpl --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-libzimg --enable-nvdec --enable-nvenc --enable-opencl --enable-opengl --enable-shared --enable-vapoursynth --enable-version3 --enable-vulkan
  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
[rawvideo @ 0x5a4c0b8685c0] Packet corrupt (stream = 0, dts = 0).
[rawvideo @ 0x5a4c0b8685c0] Estimating duration from bitrate, this may be inaccurate
Input #0, rawvideo, from 'images/fileName1715180324575.dat':
  Duration: N/A, start: 0.000000, bitrate: 103680 kb/s
  Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 720x480, 103680 kb/s, 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
Press [q] to stop, [?] for help
[in#0/rawvideo @ 0x5a4c0b8684c0] corrupt input packet in stream 0
[rawvideo @ 0x5a4c0b872700] Invalid buffer size, packet size 45235 < expected frame_size 518400
[vist#0:0/rawvideo @ 0x5a4c0b872580] Error submitting packet to decoder: Invalid argument
[swscaler @ 0x5a4c0b88f480] deprecated pixel format used, make sure you did set range correctly
[vost#0:0/mjpeg @ 0x5a4c0b875600] No filtered frames for output stream, trying to initialize anyway.
Output #0, image2, to 'output.jpg':
  Metadata:
    encoder         : Lavf60.16.100
  Stream #0:0: Video: mjpeg, yuvj420p(pc, progressive), 720x480, q=2-31, 200 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc60.31.102 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
[vist#0:0/rawvideo @ 0x5a4c0b872580] Decode error rate 1 exceeds maximum 0.666667
[out#0/image2 @ 0x5a4c0b8722c0] video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[out#0/image2 @ 0x5a4c0b8722c0] Output file is empty, nothing was encoded(check -ss / -t / -frames parameters if used)
frame=    0 fps=0.0 q=0.0 Lsize=N/A time=N/A bitrate=N/A speed=N/A    
Conversion failed!


  


  or similar errors.

  


  Question

  


  ---

  


  How can I extract the image from a video frame using ffmpeg ? Thank you

  


  A sample of the image file may be found here : github