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• No Output when transcoding RTP to HLS with ffmpeg

  9 juillet 2021, par Adnan Ahmed

  I am running ubuntu 18.04(bionic) and i have generated a live RTP stream from kurento-media-server and i am converting it to HLS with this command of ffmpeg :

  


  ffmpeg -protocol_whitelist file,udp,rtp -i rtp://127.0.0.1:55000 -vcodec libx264 -acodec libfdk_aac -f hls /live-stream/kurento-rtmp/hls/playlist.m3u8


  


  However. it shows this output and doesn't do anything and stays there. Any ideas why this is happening are really appreciated.

  


  ffmpeg version 4.3.1-0york0~18.04 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version='0york0~18.04' --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libzimg --enable-pocketsphinx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared


  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100


  


  I believe that at this stage ffmpeg is trying to determine the duration of input stream but since it is live it will never finish. If so, how would i flag ffmpeg that it is a live stream and not a local video.

  


• Creating video thumbnail with ffmpeg from buffer

  28 juillet 2021, par J. Carpenter

  Attempting to create a child process which spawns ffmpeg command. Should use the buffer from fs.readFile to write to stdin. The -i - flag tells ffmpeg to source input from stdin but nothing is happening when running this code.

  


  If replace -i - with -i test.mp4 this script works perfectly.

  


  What is wrong with the write to stdin which is not allowing code to generate thumbnail ?

  


  (async () => {
    const spawn = require('child_process').spawn;
    const fs = require('fs/promises');
    const buffer = await fs.readFile('test.mp4');
    await new Promise((resolve) => {
        console.log('Spawning process');
        const process = spawn('ffmpeg',
            [
                '-ss', '00:00:01',
                '-i', '-',
                '-s', '256x256',
                '-vframes', '1',
                '-f', 'image2',
                'output.png'
            ]);
        process.stdin.write(buffer);
        process.stdin.end();
        process.on('close', (done) => {
            console.log("Process closed: ", done);
            resolve();
        });
    });
})();


  


  Edit :

  


  Also tried this :

  


  const ffmpeg = require('fluent-ffmpeg');
module.exports =
    async (stream) => {
        ffmpeg(stream)
        .addOption('-f','rawvideo')
        .inputFormat('mov')
        .toFormat('mp4')
        .thumbnail({
            count:1,
            size:'256x256',
            filename:'test.png',
            timemarks:["00:00:03"]
        })
        .on('stdout',(stdout)=>{
            console.log(stdout);
        })
        .on('stderr',(err)=>{
            console.log(err);
        });
    }


  


  With this error output :

  


  ffmpeg version N-102781-g05f9b3a0a5 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10-win32 (GCC) 20210408
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --enable-libvmaf --enable-vulkan --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-libglslang --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp
  libavutil      57.  0.100 / 57.  0.100
  libavcodec     59.  1.102 / 59.  1.102
  libavformat    59.  3.101 / 59.  3.101
  libavdevice    59.  0.100 / 59.  0.100
  libavfilter     8.  0.102 /  8.  0.102
  libswscale      6.  0.100 /  6.  0.100
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025220812340] stream 0, offset 0x24: partial file
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025220812340] Could not find codec parameters for stream 1 (Video: h264 (avc1 / 0x31637661), none(bt709), 640x360, 2630 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'pipe:0':
  Metadata:
    major_brand     : qt
    minor_version   : 0
    compatible_brands: qt
    creation_time   : 2021-07-25T11:06:03.000000Z
  Duration: 00:00:17.38, start: 0.000000, bitrate: N/A
  Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      creation_time   : 2021-07-25T11:06:03.000000Z
      handler_name    : Core Media Audio
      vendor_id       : [0][0][0][0]
  Stream #0:1(und): Video: h264 (avc1 / 0x31637661), none(bt709), 640x360, 2630 kb/s, 29.98 fps, 29.97 tbr, 600 tbn (default)     
    Metadata:
      creation_time   : 2021-07-25T11:06:03.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
      encoder         : H.264
  Stream #0:2(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-07-25T11:06:03.000000Z
      handler_name    : Core Media Metadata
  Stream #0:3(und): Data: none (mebx / 0x7862656D), 0 kb/s (default)
    Metadata:
      creation_time   : 2021-07-25T11:06:03.000000Z
      handler_name    : Core Media Metadata
Stream mapping:
  Stream #0:1 (h264) -> scale
  split -> Stream #0:0 (libx264)
[mov,mp4,m4a,3gp,3g2,mj2 @ 0000025220812340] stream 1, offset 0xb1bf9: partial file
pipe:0: Invalid data found when processing input
Cannot determine format of input stream 0:1 after EOF
Error marking filters as finished
Conversion failed!

events.js:292
      throw er; // Unhandled 'error' event
      ^

Error: ffmpeg exited with code 1: pipe:0: Invalid data found when processing input
Cannot determine format of input stream 0:1 after EOF
Error marking filters as finished
Conversion failed!


  


• avcodec/mpeg12dec : Remove disabled frame-threading code

  29 avril, par Andreas Rheinhardt

  avcodec/mpeg12dec : Remove disabled frame-threading code
  The MPEG-1 decoder has an update_thread_context function set,
  
  yet it was never enabled (missing AV_CODEC_CAP_FRAME_THREADS
  
  flag). So remove it and also the ff_thread_finish_setup() call
  
  as well as the progress reporting.
  (Simply setting the flag would not be enough. The main problems
  
  are :
  
  a) The update_thread_context function relies on memcpy'ing
  
  the whole context instead of only copying the necessary fields.
  
  This leads to data races which is undefined behaviour.
  
  (Btw : The check for whether the non-MpegEncContext fields
  
  of Mpeg1Context should be copied has been broken in
  
  7f0efe232475d7a704924a3cb308281973e8add3.)
  
  b) Even an AVBufferRef* is simply copied, without creating a new
  
  reference.
  
  c) Copying the whole context happens only during init ; when parameters
  
  change lateron, the change is not propagated to the next thread.
  
  This affects at least the quant matrix (for MPEG-1).
  
  d) The MPEG-1/2 decoders are made to decode both MPEG-1 and MPEG-2.
  
  When MPEG-2 is decoded, another complication arises : In case of
  
  coded fields, both fields can be in one AVPacket or they can be
  
  in separate AVPackets. One would need to parse enough of the data
  
  to be able to determine whether the next thread needs to start
  
  a new frame or decode the second field of the current frame ;
  
  for this one would need to either postpone calling
  
  ff_thread_finish_setup() for coded slices altogether or implement
  
  some form of ff_h2645_packet_split().
  
  One would also need a second ThreadProgress to signal progress
  
  of each field.
  
  e) One would need to reenable waiting in ff_mpv_reconstruct_mb()
  
  for MPEG-1/2 (and H.261).
  
  f) Probably lots of other stuff for invalid input that I am currently
  
  not thinking about.
  
  If this were done, nothing from the current update_thread_context
  
  would remain, so one can just nuke it altogether.)
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpeg12dec.c