[FFmpeg-user] Transmitting Sliced-I frames with ffmpeg

[Simon Brown]

I have an encoder which gives me the option of generating sliced I frames.
These frames have a slice of I frame inserted in each frame, but there is
never a full I frame.  If I use FFMpeg to rebroadcast the stream to an HLS
stream, then it works well when I'm not using sliced I frames, but only
transmits audio when there are sliced I frames in the incoming stream.  Is
there any way of persuading it to accept sliced I frames?

I know I'm using an old version of ffmpeg, but it's built for an embedded
processor, and I've used different options and modified some examples for a
different application.  The result is that I REALLY don't want to have to
rebuild with the latest code, but if someone can assure me that the latest
build DOES support sliced I frame I will do that - I don't want to take a
gamble though.

 ~/ffmpeg/ffmpeg -i udp://127.0.0.1:65111 -bsf:v h264_mp4toannexb -hls_time
0.4 -hls_list_size 20 -hls_flags delete_segments+split_by_time -codec copy
browser.m3u8
ffmpeg version N-81696-gd38dff8e Copyright (c) 2000-2016 the FFmpeg
developers
  built with gcc 4.9.3 (Linaro GCC 4.9-2014.11) 20141031 (prerelease)
  configuration: --disable-decoders --enable-decoder=h264
--enable-decoder=vc1 --enable-decoder=aac --disable-ffplay
--disable-ffprobe --disable-ffserver --enable-neon
  libavutil      55. 29.100 / 55. 29.100
  libavcodec     57. 57.100 / 57. 57.100
  libavformat    57. 49.100 / 57. 49.100
  libavdevice    57.  0.102 / 57.  0.102
  libavfilter     6. 62.100 /  6. 62.100
  libswscale      4.  1.100 /  4.  1.100
  libswresample   2.  1.100 /  2.  1.100
[h264 @ 0xbc4a30] non-existing PPS 0 referenced
   Last message repeated 1 times
[h264 @ 0xbc4a30] decode_slice_header error
[h264 @ 0xbc4a30] non-existing PPS 0 referenced
[h264 @ 0xbc4a30] decode_slice_header error
[h264 @ 0xbc4a30] non-existing PPS 0 referenced
[h264 @ 0xbc4a30] decode_slice_header error
[h264 @ 0xbc4a30] no frame!
[h264 @ 0xbc4a30] non-existing PPS 0 referenced
    Last message repeated 1 times
[h264 @ 0xbc4a30] decode_slice_header error
[h264 @ 0xbc4a30] non-existing PPS 0 referenced
[h264 @ 0xbc4a30] decode_slice_header error
[h264 @ 0xbc4a30] non-existing PPS 0 referenced
[h264 @ 0xbc4a30] decode_slice_header error
[h264 @ 0xbc4a30] no frame!
Input #0, mpegts, from 'udp://127.0.0.1:65111':
  Duration: N/A, start: 10874.683144, bitrate: N/A
  Program 1
    Metadata:
      service_name    : PROGRAM 001
      service_provider: SVP NETWORK
    Stream #0:0[0x1100]: Video: h264 (Main) ([27][0][0][0] / 0x001B),
yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 60 fps, 60 tbr, 90k tbn, 120 tbc
    Stream #0:1[0x1110]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000
Hz, stereo, fltp, 109 kb/s
[hls @ 0xc2f540] Using AVStream.codec to pass codec parameters to muxers is
deprecated, use AVStream.codecpar instead.
    Last message repeated 1 times
Output #0, hls, to '/home/root/studio_web/myapp/public/images/browser.m3u8':
  Metadata:
    encoder         : Lavf57.49.100
    Stream #0:0: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], q=2-31, 60 fps, 60 tbr, 90k tbn, 60 tbc
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz,
stereo, 109 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)

So it clearly sees the H264 stream, but never copies any frames.

Cheers,
Simon