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• FFmpeg generated video length doesn't match expected length [on hold]

  21 juin 2018, par BentCoder

  I am using command below to generate video out of images. The problem is the length out the video generated. It is always 5 seconds less than expected. If I have 4 images, I expect to see 20 seconds of video but I am getting 15 seconds instead. The very last image img-03.jpg just appears at the end of the video as if it is a cover image. Any idea why and solution ?

  Command

  ffmpeg -y -framerate 1/5 -f image2 \
  
  -i img-%2d.jpg \
  
  -c:v libvpx-vp9 \
  
  -r 25 \
  
  -crf 30 -b:v 0 \
  
  video.webm

  Images

  img-00.jpg
  
  img-01.jpg
  
  img-02.jpg
  
  img-03.jpg

  Output

  ffmpeg version 3.2.10-1~deb9u1~bpo8+1 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with gcc 4.9.2 (Debian 4.9.2-10)
  
    configuration: --prefix=/usr --extra-version='1~deb9u1~bpo8+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 --disable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --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-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  
    libavutil      55. 34.101 / 55. 34.101
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.101 / 57. 56.101
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Input #0, image2, from 'img-%2d.jpg':
  
    Duration: 00:00:20.00, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 854x480 [SAR 1:1 DAR 427:240], 0.20 fps, 0.20 tbr, 0.20 tbn, 0.20 tbc
  
  [swscaler @ 0x55f2af60e800] deprecated pixel format used, make sure you did set range correctly
  
  [libvpx-vp9 @ 0x55f2af6276a0] v1.3.0
  
  Output #0, webm, to 'video.webm':
  
    Metadata:
  
      encoder         : Lavf57.56.101
  
      Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p, 854x480 [SAR 1:1 DAR 427:240], q=-1--1, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.64.101 libvpx-vp9
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> vp9 (libvpx-vp9))
  
  Press [q] to stop, [?] for help
  
  Input stream #0:0 frame changed from size:854x480 fmt:yuvj444p to size:854x480 fmt:yuvj420p
  
  [swscaler @ 0x55f2af602b60] deprecated pixel format used, make sure you did set range correctly
  
  frame=    4 fps=0.0 q=0.0 Lsize=     214kB time=00:00:15.00 bitrate= 117.0kbits/s speed=  16x    
  
  video:214kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.234810%

• Protocol for streaming : From a client to the server

  30 décembre 2015, par the-owner

  Context : I work in C++ with msvc2013 win32, QT-IDE, ffmpeg.

  I am looking for a protocol in order to stream video from the server to client and mostly from client to the server (two-way). On the server side, there is a tcp protocol already implemented (with QTcp).

  Question :
  For the server to client, obviously there is the RTP protocole (which is a derived UDP protocol), but for streaming into the inverse way, is there a protocol for streaming (images/video) where the client (as a client) could send a (live)stream to the server ? And is it possible (and easy) to implement this protocol under FFMPEG or QT ? (with a avformat_alloc_output_context2() for example)

  Otherwise, if FFMPEG or QT are not enough for doing this task : Is there a library that can do that under Visual-C++ Win32 ?

• FFMPEG JAVA ffmpeg doesn't work in .jar application

  3 février 2020, par xkenzzo

  FFMPEG works only in developer mode. When I compile my jar program it returns the following error
  the log of the program launched with eclipse in this case everything works

    ffmpeg version git-2019-12-29-e20c6d9 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20191125
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  
    libavutil      56. 38.100 / 56. 38.100
  
    libavcodec     58. 65.100 / 58. 65.100
  
    libavformat    58. 35.101 / 58. 35.101
  
    libavdevice    58.  9.101 / 58.  9.101
  
    libavfilter     7. 70.100 /  7. 70.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, h264, from '.h264':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuv420p(progressive), 3840x2160 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 1200k tbn, 120 tbc
  
  Output #0, mp4, to '.mp4':
  
    Metadata:
  
      encoder         : Lavf58.35.101
  
      Stream #0:0: Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 3840x2160 [SAR 1:1 DAR 16:9], q=2-31, 60 fps, 60 tbr, 15360 tbn, 120 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
  Press [q] to stop, [?] for help
  
  [mp4 @ 000001cedad59440] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
  
  frame= 9273 fps=0.0 q=-1.0 Lsize=  121326kB time=00:01:17.26 bitrate=12863.3kbits/s speed= 207x    
  
  video:121287kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.032451%

  This is where it gets complicated. You can observe the messages that FFMPEG returns to me when I launch my program compile in jar :

  > [h264 @ 0000017c43e5b700] error while decoding MB 58 6, bytestream -14
  
  > [h264 @ 0000017c43e5b700] concealing 30951 DC, 30951 AC, 30951 MV
  
  > errors in I frame [h264 @ 0000017c43e49d80] Stream #0: not enough
  
  > frames to estimate rate; consider increasing probesize [h264 @
  
  > 0000017c43e49d80] decoding for stream 0 failed

  This is the java code which thanks to the ProcessBuilder will launch FFMPEG :

  String urlVideoMp4 = movie.getPath().replace(".h264", ".mp4");
  
  
  
  File videoFinal = new File(urlVideoMp4);
  
  //checking if new video exists : if not, creating it with FFMPEG
  
  
  
  LOG.info("moviePath : " + movie);
  
  ProcessBuilder processBuilder = new ProcessBuilder(FFMPEG, "-framerate", "60", "-r", "120", "-i", movie.getPath(),"-c:v", "copy", urlVideoMp4);
  
  LOG.debug(processBuilder.command());
  
  
  
  processBuilder.inheritIO().start().waitFor();
  
  
  
  return videoFinal;