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• get specific metadata with ffprobe

  1er mai, par mikem

  I'm having a terrible time getting one single line of metadata from ffprobe.

  


  I'm running this command :

  


  


  ffprobe -show_entries 'stream_tags :
format_tags=com.apple.quicktime.creationdate' -loglevel error
IMG_9931.MOV

  


  


  And I get this output

  


  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Video

  


  TAG:encoder=H.264

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Audio

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Metadata

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Metadata

  


  [/STREAM]

  


  [STREAM]

  


  TAG:creation_time=2022-05-14T20:24:55.000000Z

  


  TAG:language=und

  


  TAG:handler_name=Core Media Metadata

  


  [/STREAM]

  


  [FORMAT]

  


  TAG:com.apple.quicktime.creationdate=2022-05-14T16:24:55-0400

  


  [/FORMAT]

  


  


  But the only thing I want returned is

  


  


  com.apple.quicktime.creationdate=2022-05-14T16:24:55-0400

  


  


  I've searched and searched but I can't find any examples of pulling a single specific value of metadata.

  


  In actuality, I really just want the value of com.apple.quicktime.creationdate... ie "2022-05-14T16:24:55-0400"

  


  I know I can grep and awk my way through it, but it seems like there should be a way to do it with ffprobe alone given all of the options it has. I just can't figure out how.

  


  How can I do this ? Any help would be appreciated.

  


• Ffmpeg stream works from cli but not inside bash script, no errors

  21 juillet 2022, par Sidharth Rao

  I'm running an Ffmpeg stream on Ubuntu writing to an rtp address, and it appears to work perfectly from my cli every time but fails to actually write anything from inside a bash script. After running from inside the cli, the bash script works every time I run it for about the next 5 minutes and then starts failing without errors again.

  


  Here is the command :

  


  ffmpeg -i video.mp4 -fflags nobuffer -flags low_delay -s 640x480 -c:v libx264 -profile:v baseline -b:v 2M -r 24 -g 60 -an -rtsp_transport tcp -f rtp rtp://CENSOREDCENSORED:0000


  


  Here is the bash script :

  


  #!/bin/bash

ffmpeg -i video.mp4 -fflags nobuffer -flags low_delay -s 640x480 -c:v libx264 -profile:v baseline -b:v 2M -r 24 -g 60 -an -rtsp_transport tcp -f rtp rtp://CENSOREDCENSORED:0000


  


  And here is the same output to cli for both of them :

  


  ffmpeg version 3.4.11-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --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 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --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-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'out.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.76.100
  Duration: 00:00:26.00, start: 0.000000, bitrate: 227 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x480, 226 kb/s, 2.31 fps, 2.31 tbr, 18464 tbn, 4.62 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x5585318623c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x5585318623c0] profile Constrained Baseline, level 3.0
Output #0, rtp, to 'rtp://us.robotics.cognitedata.com:5005':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf57.83.100
    Stream #0:0(und): Video: h264 (libx264), yuv420p, 640x480, q=-1--1, 2000 kb/s, 24 fps, 90k tbn, 24 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 0 vbv_delay: -1
SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 20.232.153.224
t=0 0
a=tool:libavformat 57.83.100
m=video 5005 RTP/AVP 96
b=AS:2000
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1

frame=  624 fps=194 q=-1.0 Lsize=    6288kB time=00:00:25.95 bitrate=1984.3kbits/s dup=564 drop=0 speed=8.08x
video:6226kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.992690%
[libx264 @ 0x5585318623c0] frame I:11    Avg QP: 2.77  size:132437
[libx264 @ 0x5585318623c0] frame P:613   Avg QP: 4.97  size:  8024
[libx264 @ 0x5585318623c0] mb I  I16..4: 20.2%  0.0% 79.8%
[libx264 @ 0x5585318623c0] mb P  I16..4:  0.8%  0.0%  2.0%  P16..4: 12.3%  1.0%  1.2%  0.0%  0.0%    skip:82.6%
[libx264 @ 0x5585318623c0] final ratefactor: 6.07
[libx264 @ 0x5585318623c0] coded y,uvDC,uvAC intra: 87.7% 87.0% 68.2% inter: 8.6% 7.0% 6.6%
[libx264 @ 0x5585318623c0] i16 v,h,dc,p: 34% 15% 41% 10%
[libx264 @ 0x5585318623c0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 43% 24% 13%  3%  3%  3%  4%  3%  4%
[libx264 @ 0x5585318623c0] i8c dc,h,v,p: 36% 22% 37%  6%
[libx264 @ 0x5585318623c0] ref P L0: 97.5%  1.9%  0.6%
[libx264 @ 0x5585318623c0] kb/s:1961.69


  


  The ffmpeg stream also fails from inside of a docker image.

  


• Minimal sample of muxing two streams with no reencoding (av_interleaved_write_frame fails)

  19 juillet 2022, par Alvein

  What I'm trying to do : having two files, one is video-only and the other is audio-only, with identical durations, I want to "join" them in a single container.

  


  I previously made a routine which just copied all the streams inside a container to another one. No reencoding, etc. This works perfectly :

  


  while(true) {
    pkIn=av_packet_alloc();
    if(NULL==pkIn) {
        fprintf(stderr,"av_packet_alloc() failed");
        break;
    }
    iError=av_read_frame(fcIn,pkIn);
    if(0>iError)
        if(AVERROR_EOF==iError)
            break;
        else {
            fprintf(stderr,"av_read_frame() failed");
            break;
        }
    stIn=fcIn->streams[pkIn->stream_index];
    stOut=fcOut->streams[pkIn->stream_index];
    log_packet(fcIn,pkIn,"in");
    av_packet_rescale_ts(pkIn,stIn->time_base,stOut->time_base);
    pkIn->pos=-1;
    log_packet(fcOut,pkIn,"out");
    iError=av_interleaved_write_frame(fcOut,pkIn);
    if(0>iError) {
        fprintf(stderr,"av_interleaved_write_frame() failed");
        break;
    }
    av_packet_free(&pkIn);
}


  


  I just did the analogy and tried to do the same, but taking each stream from a distinct container, like this :

  


  while(true) {
    if(!bVideoInEOF) {
        pkVideoIn=av_packet_alloc();
        if(NULL==pkVideoIn) {
            fprintf(stderr,"av_packet_alloc(video in) failed");
            break;
        }
        iError=av_read_frame(fcVideoIn,pkVideoIn);
        if(0>iError)
            if(AVERROR_EOF==iError)
                bVideoInEOF=true;
            else {
                fprintf(stderr,"av_read_frame(video in) failed");
                break;
            }
        if(!bVideoInEOF) {
            log_packet(fcVideoIn,pkVideoIn,"video in");
            av_packet_rescale_ts(pkVideoIn,stVideoIn->time_base,stVideoOut->time_base);
            pkVideoIn->pos=-1;
            pkVideoIn->stream_index=stVideoOut->index; // Edit (2022-07-19)
            log_packet(fcVideoIn,pkVideoIn,"video out");
            iError=av_interleaved_write_frame(fcOut,pkVideoIn);
            if(0>iError) {
                fprintf(stderr,"av_interleaved_write_frame(video out) failed");
                break;
            }
        }
        av_packet_free(&pkVideoIn);
    }
    if(!bAudioInEOF) {
        pkAudioIn=av_packet_alloc();
        if(NULL==pkAudioIn) {
            fprintf(stderr,"av_packet_alloc(audio in) failed");
            break;
        }
        iError=av_read_frame(fcAudioIn,pkAudioIn);
        if(0>iError)
            if(AVERROR_EOF==iError)
                bAudioInEOF=true;
            else {
                fprintf(stderr,"av_read_frame(audio in) failed");
                break;
            }
        if(!bAudioInEOF) {
            log_packet(fcAudioIn,pkAudioIn,"audio in");
            av_packet_rescale_ts(pkAudioIn,stAudioIn->time_base,stAudioOut->time_base);
            pkAudioIn->pos=-1;
            pkAudioIn->stream_index=stAudioOut->index; // Edit (2022-07-19)
            log_packet(fcAudioIn,pkAudioIn,"audio out");
            iError=av_interleaved_write_frame(fcOut,pkAudioIn);
            if(0>iError) {
                fprintf(stderr,"av_interleaved_write_frame(audio out) failed");
                break;
            }
        }
        av_packet_free(&pkAudioIn);
    }
    if(bVideoInEOF&&bAudioInEOF)
        break;
}


  


  I know the previous code looks like redundant but I wanted to leave both streams "processing" separated the way you understand my plans.

  


  Anyway, that code ends quickly with "av_interleaved_write_frame(audio out) failed".

  


  The error detail is "Invalid argument", and the debugger shows this :

  


  


  Application provided invalid, non monotonically increasing dts to
muxer in stream 0.

  


  


  If I disable any of the main blocks "if(!bVideoInEOF)" / "if(!bAudioInEOF)", the file is written successfully, with the obvious lack of the disabled stream.

  


  I'm new into using this library so probably I'm doing something really stupid, or missing something obvious.

  


  Suggestions ?

  


  Edit (2022-07-19) :

  


  By checking the logs, I noticed I was writing every frame to the stream #0. Hence, the horrible jumps in PTS/DTS.

  


  Code edited by adding the corresponding "...->stream_index=" before each call to av_interleaved_write_frame().

  


  ...

  


  Though it works, I still think my code is far from perfect. Comments are welcome.