[mythtv] Mythtranscode HLS/AVF heavily distorted output

[William Wilhelm]

I have just tried this now, and the lossless transcode does strip the 
irrelevant streams, but the --avf transcode is still distorted.


On 25 July 2015 7:11:43 pm John Pilkington <J.Pilk at tesco.net> wrote:

> On 25/07/15 08:48, William Wilhelm wrote:
> > Ever since 0.27 -> 0.28, mythtranscode --avf/--hls has been giving very
> > distorted output for transcodings of FTA recordings here in Australia.
> > Prebuilt "nightlies" from Mythbuntu and my own weekly builds from master
> > both experience this issue. Audio is unaffected.
> >
> > All channels are affected except for ABC News 24 and SBS 2.
> > To describe heavily distorted more: http://i.imgur.com/hfgrn2i.png.
> >
> > Here is mythffprobe output for an affected recording file before
> > transcoding:
> >
> > ffprobe version v0.28-pre-2986-g004b87d Copyright (c) 2007-2014 the
> > FFmpeg developers
> >    built on Jul 25 2015 11:49:45 with gcc 4.9.2 (Gentoo 4.9.2 p1.0,
> > pie-0.6.2)
> >    configuration: --python=python2 --enable-libx264
> >    libavutil      52. 92.100 / 52. 92.100
> >    libavcodec     55. 69.100 / 55. 69.100
> >    libavformat    55. 48.100 / 55. 48.100
> >    libavdevice    55. 13.102 / 55. 13.102
> >    libavfilter     4. 11.100 /  4. 11.100
> >    libswscale      2.  6.100 /  2.  6.100
> >    libswresample   0. 19.100 /  0. 19.100
> >    libpostproc    52.  3.100 / 52.  3.100
> > [mpegts @ 0x6a5020] write_section_data: PID 0x901 CRC error
> > [mpegts @ 0x6a5020] write_section_data: PID 0x322 CRC error
> > [mpegts @ 0x6a5020] write_section_data: PID 0x901 CRC error
> > [mpegts @ 0x6a5020] write_section_data: PID 0x322 CRC error
> > [NULL @ 0x6ab2a0] start time for stream 3 is not set in
> > estimate_timings_from_pts
> > [NULL @ 0x6acf80] start time for stream 4 is not set in
> > estimate_timings_from_pts
> > [mpegts @ 0x6a5020] write_section_data: PID 0x901 CRC error
> > [mpegts @ 0x6a5020] PES packet size mismatch
> > Input #0, mpegts, from 'fails2.ts':
> >    Duration: 00:00:08.44, start: 95228.329600, bitrate: 4911 kb/s
> >      Stream #0:0[0x205]: Video: mpeg2video (Main), yuv420p(tv), 720x576
> > [SAR 64:45 DAR 16:9], max. 15000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
> >      Stream #0:1[0x2bc](eng): Audio: mp2, 48000 Hz, stereo, s16p, 192 kb/s
> >      Stream #0:2[0x245](eng): Subtitle: dvb_teletext
> >      Stream #0:3[0x901]: Data: dsmcc_b
> >      Stream #0:4[0x322]: Data: dsmcc_b
> > Unsupported codec with id 94215 for input stream 2
> > Unsupported codec with id 1095979811 for input stream 3
> > Unsupported codec with id 1095979811 for input stream 4
> >
> > Output for a non affected recording (from ABC News 24 or SBS 2) has
> > similar output which I can provide if needed.
> > Have several samples of affected and non-affected recordings that I can
> > share.
> >
> > Thanks,
> > Will
>
> Have you tried doing a lossless transcode (-m) first?  It might discard
> all the streams that ffprobe dislikes.
>
> John P
>
>
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