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• ffmpeg writes invalid fps to the mp4 container (and in avi it is true). What is the reason ?

  8 juin 2020, par Ivan Sh.

  I need to record frames in real time. To test this situation, I make pts non-linear (since frames may be lost), thus :

  



  // AVFrame
video_frame->pts = prev_pts + 2;


  



  I use libavformat to write to a file. Parameters AVCodecContext and AVStream :

  



  #define STREAM_FRAME_RATE 25
#define CODEC_PIX_FMT  AV_PIX_FMT_YUV420P
#define FRAME_WIDTH 1440
#define FRAME_HEIGHT 900

// AVCodecContext
cc->codec_id = video_codec->id;
cc->bit_rate = 400000;
cc->width = FRAME_WIDTH;
cc->height = FRAME_HEIGHT;
cc->gop_size = 12;
cc->pix_fmt = CODEC_PIX_FMT;

// AVStream
video_stream->time_base = AVRational{ 1, STREAM_FRAME_RATE };
cc->time_base = video_stream->time_base;
cc->framerate = AVRational{ STREAM_FRAME_RATE , 1 };


  



  Write to file :

  



  static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt)
{
    /* rescale output packet timestamp values from codec to stream timebase */
    //av_packet_rescale_ts(pkt, *time_base, st->time_base);
    pkt->pts = av_rescale_q(pkt->pts, *time_base, st->time_base);
    pkt->dts = av_rescale_q(pkt->dts, *time_base, st->time_base);
    pkt->stream_index = st->index;

    /* Write the compressed frame to the media file. */
    //log_packet(fmt_ctx, pkt);
    //return av_write_frame(fmt_ctx, pkt);
    return av_interleaved_write_frame(fmt_ctx, pkt);
}


  



  If you use the avi container, then the information on the number of frames per second is indicated correctly in the file : 25 fps

  



  

  



  If you use the mp4 container, then the file information about the number of frames per second is indicated incorrectly : 12.5 fps

  



  

  



  Tell me, please, what other settings need to be added ?

  


• Add coverart into ogg container with ffmpeg

  21 mars 2021, par SebMa

  I'm trying to add a coverart into an ogg file with ffmpeg :


  



  Here are my source.ogg and source.jpg files :

  



  $ ffprobe -hide_banner source.ogg 
Input #0, ogg, from 'source.ogg':
  Duration: 00:03:02.45, start: 0.007500, bitrate: 73 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100
$ identify source.jpg 
source.jpg JPEG 480x360 480x360+0+0 8-bit DirectClass 15.1KB 0.000u 0:00.000


  



  I tried this :

  



  $ ffmpeg -hide_banner -i source.ogg -i source.jpg -map 0 -map 1 -c:a copy -c copy -map_metadata 0 dest.ogg -y && echo && ffprobe -hide_banner dest.ogg 
Input #0, ogg, from 'source.ogg':
  Duration: 00:03:02.45, start: 0.007500, bitrate: 73 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100
Input #1, image2, from 'source.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 3023 kb/s
    Stream #1:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 480x360 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc
[ogg @ 0x5655578064c0] Unsupported codec id in stream 1
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #1:0 -> #0:1 (copy)
    Last message repeated 1 times
[ogg @ 0x5655577e8540] Format ogg detected only with low score of 1, misdetection possible!
dest.ogg: End of file


  



  I've also found this answer but it does not explain how to do it with ffmpeg.

  



  I've read about a "METADATA_BLOCK_PICTURE" metadata in the ogg container that might contain the picture in base64, so I tried this :

  



  $ ffmpeg -hide_banner -i source.ogg -map 0 -c:a copy -c copy -metadata METADATA_BLOCK_PICTURE="$(base64 source.jpg)" dest.ogg
Input #0, ogg, from 'source.ogg':
  Duration: 00:03:02.45, start: 0.007500, bitrate: 73 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100
File 'dest.ogg' already exists. Overwrite ? [y/N] y
Output #0, ogg, to 'dest.ogg':
  Metadata:
    METADATA_BLOCK_PICTURE: /9j/4AAQSkZJRgABAQAAAQABAAD/2wCEABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkz
                    : ODdASFxOQERXRTc4UG1RV19iZ2hnPk1xeXBkeFxlZ2MBERISGBUYLxoaL2NCOEJjY2NjY2NjY2Nj
                    ..............................................................................
                    : nVmaS2E/urUWVbH6ORI9z2l8zyRfFpkLooIHSBuk9lFFoC6OBnP1SON8rEooqM2WOVHDdRRAAUVK
                    : KiiCWRRRRBJ//9k=
    encoder         : Lavf58.20.100
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100
      METADATA_BLOCK_PICTURE: /9j/4AAQSkZJRgABAQAAAQABAAD/2wCEABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkz
                      : ODdASFxOQERXRTc4UG1RV19iZ2hnPk1xeXBkeFxlZ2MBERISGBUYLxoaL2NCOEJjY2NjY2NjY2Nj
                      : Y2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY//AABEIAWgB4AMBIgACEQED
                      ..............................................................................
                      : nVmaS2E/urUWVbH6ORI9z2l8zyRfFpkLooIHSBuk9lFFoC6OBnP1SON8rEooqM2WOVHDdRRAAUVK
                      : KiiCWRRRRBJ//9k=
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=    1658kB time=00:03:02.41 bitrate=  74.5kbits/s speed=1.01e+03x    
video:0kB audio:1624kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.100392%


  



  It kinda "worked", but neither ffplay nor mpv can parse the cover art :

  



  $ ffplay -hide_banner dest.ogg
[ogg @ 0x5655577e8540] Failed to parse cover art block.
Input #0, ogg, from 'dest.ogg':
  Duration: 00:03:02.44, start: 0.000000, bitrate: 74 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100
   3.95 M-A: -0.000 fd=   0 aq=   14KB vq=    0KB sq=    0B f=0/0    
$ mpv dest.ogg 
Playing: dest.ogg
[ffmpeg/demuxer] ogg: Failed to parse cover art block.
 (+) Audio --aid=1 (opus 2ch 48000Hz)
AO: [pulse] 48000Hz stereo 2ch float
A: 00:00:03 / 00:03:02 (2%)


Exiting... (Quit)


  



  I alse tried -metadata:s:a along with the --wrap 0 of base64 (which I had forgotten to specify, oops :) ) :

  



  $ ffmpeg -i source.ogg -map 0 -c:a copy -c copy -metadata:s:a METADATA_BLOCK_PICTURE="$(base64 --wrap 0 source.jpg)" dest.ogg
Input #0, ogg, from 'source.ogg':
  Duration: 00:03:02.45, start: 0.007500, bitrate: 73 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100
File 'dest.ogg' already exists. Overwrite ? [y/N] y
Output #0, ogg, to 'dest.ogg':
  Metadata:
    encoder         : Lavf58.20.100
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100
      METADATA_BLOCK_PICTURE: /9j/4AAQSkZJRgABAQAAAQABAAD/2wCEABALDA4MChAODQ4SERATGCgaGBYWGDEjJR0oOjM9PDkzODdASFxOQERXRTc4UG1RV19iZ2hnPk1xeXBkeFxlZ2MBERISGBUYLxoaL2NCOEJjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY2NjY//AABEIAWgB4AMBIgACEQEDEQH/xAAaAAACAwEBAAAAAAAAAAA
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=    1658kB time=00:03:02.41 bitrate=  74.5kbits/s speed=1.22e+03x    
video:0kB audio:1624kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.084397%


  



  But still the dest.ogg jpg coverart cannot be read properly :

  



  $ ffprobe -hide_banner dest.ogg 
[ogg @ 0x5655577e8540] Invalid picture type: -2555936.
[ogg @ 0x5655577e8540] Could not read mimetype from an attached picture.
Input #0, ogg, from 'dest.ogg':
  Duration: 00:03:02.44, start: 0.000000, bitrate: 74 kb/s
    Stream #0:0: Audio: opus, 48000 Hz, stereo, fltp
    Metadata:
      DURATION        : 00:03:02.441000000
      ENCODER         : Lavf58.20.100


  



  Can you please help me ?

  


• ffmpeg : audio to opus and embed song cover to lossless vp9 in webm container

  14 mars 2020, par snow344

  im having some trouble in making a lossless webm of a audio file

  mpv plays it fine, but youtube won’t process it no matter what

  ffmpeg -i "audio.flac" -c:v vp9 -c:a libopus -lossless 1 -b:a 500k -pix_fmt yuv420p test.webm
  
  
  
      Stream #0:0: Audio: flac, 44100 Hz, stereo, s16
  
      Stream #0:1: Video: mjpeg (Progressive), yuv444p(pc, bt470bg/unknown/unknown), 800x800 [SAR 300:300 DAR 1:1], 90k tbr, 90k tbn, 90k tbc (attached pic)
  
      Metadata:
  
        comment         : Cover (front)
  
  File 'test.webm' already exists. Overwrite? [y/N] y
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (mjpeg (native) -> vp9 (libvpx-vp9))
  
    Stream #0:0 -> #0:1 (flac (native) -> opus (libopus))
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0000028ef88c6000] deprecated pixel format used, make sure you did set range correctly
  
  [libvpx-vp9 @ 0000028ef854cf00] v1.8.2
  
  Output #0, webm, to 'test.webm':
  
      Stream #0:0: Video: vp9 (libvpx-vp9), yuv420p(progressive), 800x800 [SAR 1:1 DAR 1:1], q=-1--1, 90k fps, 1k tbn, 90k tbc (attached pic)
  
      Metadata:
  
        comment         : Cover (front)
  
        encoder         : Lavc58.73.101 libvpx-vp9
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  
      Stream #0:1: Audio: opus (libopus), 48000 Hz, stereo, s16, 500 kb/s
  
      Metadata:
  
        encoder         : Lavc58.73.101 libopus
  
  frame=    1 fps=0.2 q=0.0 Lsize=   15327kB time=00:04:11.17 bitrate= 499.9kbits/s speed=53.7x
  
  video:386kB audio:14853kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.574758%

  thanks in advance