[Libav-user] Possibly invalid AVStream::start_time when first frame is not a key-frame

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[Libav-user] Possibly invalid AVStream::start_time when first frame is not a key-frame

biosthezerg
Hi everyone,

I've come upon a rather curious phenomenon in a video which seems to have video frames in an unusual order. Sadly, it's a video from our client which I cannot share (and I have no idea how to replicate it). The weird bit about it is that (although `dts` are increasing as expected), packets' `pts` go in this order: 6006, 0, 3003, 15015, 9009, 12012, 24024, 18018, 21021, 33033, 27027, 30030, 42042, 36036, 39039 [1]. Due to the fact that the first frame doesn't have `pts=0`, the whole stream `start_pts` is set to 6006 instead of 0 [2]. If it helps, it came straight out of a semi-professional Panasonic camera without any reencoding, as far as I know.

Now according to the docs, `AVStream::start_time` should be "pts of the first frame of the stream in presentation order" which I interpret as "the lowest pts there is". However, I keep getting the first frames' `pts`. Here's my calls, nothing complicated:
```
avformat_open_input(&_avFormatContext, _filename.c_str(), NULL, NULL);
avformat_find_stream_info(_avFormatContext, NULL);
```
(+ some unimportant checks).

I've tried debugging it through and it got me to this place: https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/utils.c#L1164 where the `start_time` is set. It is however never updated based on the next frame's (lower) pts, so I have an incorrect start time to work with. I can get the number updated using this hack at the beginning of `update_initial_timestamps`:
```
if (st->start_time != AV_NOPTS_VALUE /*EDITED BY KAREL*/ && st->start_time > pts) {
  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO || !(pkt->flags & AV_PKT_FLAG_DISCARD)) {
      st->start_time = pts;
  }
  if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->codecpar->sample_rate) {
      st->start_time += av_rescale_q(st->skip_samples, (AVRational){1, st->codecpar->sample_rate}, st->time_base);
  }
}
```
but I'm not sure if it wouldn't break anything else...

Now to my questions, for which I'd be really gratefull if anybody knew the answers. Is this kind of video normal/correct/according to standard? Am I correct to think that the stream's `start_time` should in fact be 0? What can I do about it? Is my hack dangerous to anything else; could it possibly break decoding of other videos?

Many thanks in advance!
Karel


[1] ffprobe output showing the packets with their out-of-order pts:
ffprobe -show_packets P1010836.MOV  | head -n 500
ffprobe version 3.4.4-1~16.04.york0 Copyright (c) 2007-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --prefix=/usr --extra-version='1~16.04.york0' --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-libd
 rm --ena
 ble-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version='1~16.04.york0' --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 --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  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 'P1010836.MOV':
  Metadata:
    major_brand     : qt  
    minor_version   : 537986816
    compatible_brands: qt  pana
    creation_time   : 2019-06-12T13:54:36.000000Z
    com.panasonic.Semi-Pro.metadata.xml: <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
                    : <ClipMain xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:schemas-Professional-Plug-in:Semi-Pro:ClipMetadata:v1.0">
                    :   <ClipContent>
                    :     <GlobalClipID>060A2B340101010501010D2113000000DF54DE53A0BB5534685D1090C1A20117</GlobalClipID>
                    :     <Duration>4845</Duration>
                    :     <EditUnit>1001/30000</EditUnit>
                    :     <EssenceList>
                    :       <Video>
                    :         <Codec BitRate="100">H264_420_LongGOP</Codec>
                    :         <ActiveLine>2160</ActiveLine>
                    :         <ActivePixel>3840</ActivePixel>
                    :         <BitDepth>8</BitDepth>
                    :         <FrameRate>29.97p</FrameRate>
                    :         <TimecodeType>Drop</TimecodeType>
                    :         <StartTimecode>12:19:04:01</StartTimecode>
                    :       </Video>
                    :       <Audio>
                    :         <Channel>2</Channel>
                    :         <SamplingRate>48000</SamplingRate>
                    :         <BitsPerSample>16</BitsPerSample>
                    :       </Audio>
                    :     </EssenceList>
                    :     <ClipMetadata>
                    :       <Rating>0</Rating>
                    :       <Access>
                    :         <CreationDate>2019-06-12T13:54:36+00:00</CreationDate>
                    :         <LastUpdateDate>2019-06-12T13:54:36+00:00</LastUpdateDate>
                    :       </Access>
                    :       <Device>
                    :         <Manufacturer>Panasonic</Manufacturer>
                    :         <ModelName>DC-GH5S</ModelName>
                    :       </Device>
                    :       <Shoot>
                    :         <StartDate>2019-06-12T13:54:36+00:00</StartDate>
                    :       </Shoot>
                    :     </ClipMetadata>
                    :   </ClipContent>
                    :   <UserArea>
                    :     <AcquisitionMetadata xmlns="urn:schemas-Professional-Plug-in:P2:CameraMetadata:v1.2">
                    :       <CameraUnitMetadata>
                    :         <Gamma>
                    :           <CaptureGamma>STANDARD</CaptureGamma>
                    :         </Gamma>
                    :         <Gamut>
                    :           <CaptureGamut>BT.709</CaptureGamut>
                    :         </Gamut>
                    :       </CameraUnitMetadata>
                    :     </AcquisitionMetadata>
                    :   </UserArea>
                    : </ClipMain>
                    :
  Duration: 00:02:41.66, start: 0.000000, bitrate: 96239 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 94690 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2019-06-12T13:54:36.000000Z
      timecode        : 12:19:04;01
    Stream #0:1(und): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2019-06-12T13:54:36.000000Z
      timecode        : 12:19:04;01
    Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2019-06-12T13:54:36.000000Z
      timecode        : 12:19:04;01
Unsupported codec with id 0 for input stream 2
[PACKET]
codec_type=data
stream_index=2
pts=0
pts_time=0.000000
dts=0
dts_time=0.000000
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262160
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=3003
pts_time=0.033367
dts=3003
dts_time=0.033367
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262164
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=6006
pts_time=0.066733
dts=6006
dts_time=0.066733
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262168
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=9009
pts_time=0.100100
dts=9009
dts_time=0.100100
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262172
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=12012
pts_time=0.133467
dts=12012
dts_time=0.133467
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262176
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=15015
pts_time=0.166833
dts=15015
dts_time=0.166833
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262180
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=18018
pts_time=0.200200
dts=18018
dts_time=0.200200
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262184
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=21021
pts_time=0.233567
dts=21021
dts_time=0.233567
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262188
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=24024
pts_time=0.266933
dts=24024
dts_time=0.266933
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262192
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=27027
pts_time=0.300300
dts=27027
dts_time=0.300300
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262196
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=30030
pts_time=0.333667
dts=30030
dts_time=0.333667
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262200
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=33033
pts_time=0.367033
dts=33033
dts_time=0.367033
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262204
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=36036
pts_time=0.400400
dts=36036
dts_time=0.400400
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262208
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=39039
pts_time=0.433767
dts=39039
dts_time=0.433767
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262212
flags=K_
[/PACKET]
[PACKET]
codec_type=data
stream_index=2
pts=42042
pts_time=0.467133
dts=42042
dts_time=0.467133
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=4
pos=262216
flags=K_
[/PACKET]
[PACKET]
codec_type=video
stream_index=0
pts=6006
pts_time=0.066733
dts=-3003
dts_time=-0.033367
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=741081
pos=262220
flags=K_
[/PACKET]
[PACKET]
codec_type=video
stream_index=0
pts=0
pts_time=0.000000
dts=0
dts_time=0.000000
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=75985
pos=1003301
flags=__
[/PACKET]
[PACKET]
codec_type=video
stream_index=0
pts=3003
pts_time=0.033367
dts=3003
dts_time=0.033367
duration=3003
duration_time=0.033367
convergence_duration=N/A
convergence_duration_time=N/A
size=89063
pos=1079286
flags=__
[/PACKET]
... (trimmed)

[2] ffprobe output showing the incorrect start_pts:
ffprobe -show_streams P1010836.MOV
ffprobe version 3.4.4-1~16.04.york0 Copyright (c) 2007-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.10) 20160609
  configuration: --prefix=/usr --extra-version='1~16.04.york0' --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-libd
 rm --ena
 ble-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  WARNING: library configuration mismatch
  avcodec     configuration: --prefix=/usr --extra-version='1~16.04.york0' --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 --enable-version3 --disable-doc --disable-programs --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libtesseract --enable-libvo_amrwbenc
  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 'P1010836.MOV':
  Metadata:
    major_brand     : qt  
    minor_version   : 537986816
    compatible_brands: qt  pana
    creation_time   : 2019-06-12T13:54:36.000000Z
    com.panasonic.Semi-Pro.metadata.xml: <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
                    : <ClipMain xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:schemas-Professional-Plug-in:Semi-Pro:ClipMetadata:v1.0">
                    :   <ClipContent>
                    :     <GlobalClipID>060A2B340101010501010D2113000000DF54DE53A0BB5534685D1090C1A20117</GlobalClipID>
                    :     <Duration>4845</Duration>
                    :     <EditUnit>1001/30000</EditUnit>
                    :     <EssenceList>
                    :       <Video>
                    :         <Codec BitRate="100">H264_420_LongGOP</Codec>
                    :         <ActiveLine>2160</ActiveLine>
                    :         <ActivePixel>3840</ActivePixel>
                    :         <BitDepth>8</BitDepth>
                    :         <FrameRate>29.97p</FrameRate>
                    :         <TimecodeType>Drop</TimecodeType>
                    :         <StartTimecode>12:19:04:01</StartTimecode>
                    :       </Video>
                    :       <Audio>
                    :         <Channel>2</Channel>
                    :         <SamplingRate>48000</SamplingRate>
                    :         <BitsPerSample>16</BitsPerSample>
                    :       </Audio>
                    :     </EssenceList>
                    :     <ClipMetadata>
                    :       <Rating>0</Rating>
                    :       <Access>
                    :         <CreationDate>2019-06-12T13:54:36+00:00</CreationDate>
                    :         <LastUpdateDate>2019-06-12T13:54:36+00:00</LastUpdateDate>
                    :       </Access>
                    :       <Device>
                    :         <Manufacturer>Panasonic</Manufacturer>
                    :         <ModelName>DC-GH5S</ModelName>
                    :       </Device>
                    :       <Shoot>
                    :         <StartDate>2019-06-12T13:54:36+00:00</StartDate>
                    :       </Shoot>
                    :     </ClipMetadata>
                    :   </ClipContent>
                    :   <UserArea>
                    :     <AcquisitionMetadata xmlns="urn:schemas-Professional-Plug-in:P2:CameraMetadata:v1.2">
                    :       <CameraUnitMetadata>
                    :         <Gamma>
                    :           <CaptureGamma>STANDARD</CaptureGamma>
                    :         </Gamma>
                    :         <Gamut>
                    :           <CaptureGamut>BT.709</CaptureGamut>
                    :         </Gamut>
                    :       </CameraUnitMetadata>
                    :     </AcquisitionMetadata>
                    :   </UserArea>
                    : </ClipMain>
                    :
  Duration: 00:02:41.66, start: 0.000000, bitrate: 96239 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 94690 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc (default)
    Metadata:
      creation_time   : 2019-06-12T13:54:36.000000Z
      timecode        : 12:19:04;01
    Stream #0:1(und): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2019-06-12T13:54:36.000000Z
      timecode        : 12:19:04;01
    Stream #0:2(und): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2019-06-12T13:54:36.000000Z
      timecode        : 12:19:04;01
Unsupported codec with id 0 for input stream 2
[STREAM]
index=0
codec_name=h264
codec_long_name=H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
profile=High
codec_type=video
codec_time_base=1001/60000
codec_tag_string=avc1
codec_tag=0x31637661
width=3840
height=2160
coded_width=3840
coded_height=2160
has_b_frames=1
sample_aspect_ratio=1:1
display_aspect_ratio=16:9
pix_fmt=yuv420p
level=51
color_range=tv
color_space=bt709
color_transfer=bt709
color_primaries=bt709
chroma_location=left
field_order=unknown
timecode=N/A
refs=1
is_avc=true
nal_length_size=4
id=N/A
r_frame_rate=30000/1001
avg_frame_rate=30000/1001
time_base=1/90000
start_pts=6006
start_time=0.066733
duration_ts=14549535
duration=161.661500
bit_rate=94690004
max_bit_rate=N/A
bits_per_raw_sample=8
nb_frames=4845
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:creation_time=2019-06-12T13:54:36.000000Z
TAG:language=und
TAG:timecode=12:19:04;01
[/STREAM]
[STREAM]
index=1
codec_name=pcm_s16be
codec_long_name=PCM signed 16-bit big-endian
profile=unknown
codec_type=audio
codec_time_base=1/48000
codec_tag_string=twos
codec_tag=0x736f7774
sample_fmt=s16
sample_rate=48000
channels=2
channel_layout=unknown
bits_per_sample=16
id=N/A
r_frame_rate=0/0
avg_frame_rate=0/0
time_base=1/48000
start_pts=0
start_time=0.000000
duration_ts=7759752
duration=161.661500
bit_rate=1536000
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=7759752
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:creation_time=2019-06-12T13:54:36.000000Z
TAG:language=und
TAG:timecode=12:19:04;01
[/STREAM]
[STREAM]
index=2
codec_name=unknown
codec_long_name=unknown
profile=unknown
codec_type=data
codec_tag_string=tmcd
codec_tag=0x64636d74
id=N/A
r_frame_rate=0/0
avg_frame_rate=30/1
time_base=1/90000
start_pts=0
start_time=0.000000
duration_ts=14549535
duration=161.661500
bit_rate=959
max_bit_rate=N/A
bits_per_raw_sample=N/A
nb_frames=4845
nb_read_frames=N/A
nb_read_packets=N/A
DISPOSITION:default=1
DISPOSITION:dub=0
DISPOSITION:original=0
DISPOSITION:comment=0
DISPOSITION:lyrics=0
DISPOSITION:karaoke=0
DISPOSITION:forced=0
DISPOSITION:hearing_impaired=0
DISPOSITION:visual_impaired=0
DISPOSITION:clean_effects=0
DISPOSITION:attached_pic=0
DISPOSITION:timed_thumbnails=0
TAG:creation_time=2019-06-12T13:54:36.000000Z
TAG:language=und
TAG:timecode=12:19:04;01
[/STREAM]
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