[FFmpeg-trac] #7870(undetermined:new): HEVC: JPEG output does not wait until a complete frame is found

[FFmpeg]

#7870: HEVC: JPEG output does not wait until a complete frame is found
-------------------------------------+-------------------------------------
             Reporter:  nafmo        |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:  git-
  undetermined                       |  master
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the bug:
 I am trying to generate a screenshot from a HEVC stream, but it fails,
 giving me a partial image.

 The stream is a MPEG transport stream received off the Astra satellite,
 where I fetch several seconds worth of data. Since I do not know where I
 jump into the data stream, it does not necessarily start with a key frame,
 so I expect ffmpeg to continue decoding the stream until it has enough
 data to create a proper image, but the actual result is that I get a
 partially decoded image.

 How to reproduce:
 {{{
 $ ffmpeg -an -i Astra_UHD1_\(1\).ts -vframes 1 ffmpeg-bug.jpg
 ffmpeg version N-93674-g1e01f66822 Copyright (c) 2000-2019 the FFmpeg
 developers
   built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
   configuration:
   libavutil      56. 26.100 / 56. 26.100
   libavcodec     58. 52.100 / 58. 52.100
   libavformat    58. 27.103 / 58. 27.103
   libavdevice    58.  7.100 / 58.  7.100
   libavfilter     7. 49.100 /  7. 49.100
   libswscale      5.  4.100 /  5.  4.100
   libswresample   3.  4.100 /  3.  4.100
 [hevc @ 0x55af326de000] PPS id out of range: 0
     Last message repeated 1 times
 [hevc @ 0x55af326de000] Error parsing NAL unit #2.
 [...these error messages are repeated several times...]
 Input #0, mpegts, from 'Astra_UHD1_(1).ts':
   Duration: 00:00:11.28, start: 72787.815722, bitrate: 14235 kb/s
   Program 2
     Metadata:
       service_name    : UHD1 by ASTRA / HD+
       service_provider: SES ASTRA
     Stream #0:0[0x65]: Video: hevc (Main 10) ([36][0][0][0] / 0x0024),
 yuv420p10le(tv, bt2020nc/bt2020/arib-std-b67), 3840x2160 [SAR 1:1 DAR
 16:9], 50 fps, 50 tbr, 90k tbn, 50 tbc
     Stream #0:1[0x66](deu): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
 stereo, fltp, 192 kb/s (clean effects)
 Stream mapping:
   Stream #0:0 -> #0:0 (hevc (native) -> mjpeg (native))
 Press [q] to stop, [?] for help
 [hevc @ 0x55af3279f000] Could not find ref with POC 32
 [swscaler @ 0x55af3559f480] deprecated pixel format used, make sure you
 did set range correctly
 Output #0, image2, to 'ffmpeg-bug2.jpg':
   Metadata:
     encoder         : Lavf58.27.103
     Stream #0:0: Video: mjpeg, yuvj420p(pc), 3840x2160 [SAR 1:1 DAR 16:9],
 q=2-31, 200 kb/s, 50 fps, 50 tbn, 50 tbc
     Metadata:
       encoder         : Lavc58.52.100 mjpeg
     Side data:
       cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
 frame=    1 fps=0.0 q=4.8 Lsize=N/A time=00:00:00.02 bitrate=N/A dup=1
 drop=1 speed=0.0333x
 video:90kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
 muxing overhead: unknown
 }}}

 My current workaround is to pass `-ss 1` to hard-code decoding one second
 of video, to make sure I get to an I-frame.

 The off-air clip used is available here:
 https://www.dropbox.com/s/jmmo8rdjc4a12hb/Astra_UHD1_%281%29.ts?dl=0

--
Ticket URL: <https://trac.ffmpeg.org/ticket/7870>
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