[FFmpeg-user] Problem "live" transcoding via piped input / Ceton InfiniTV 4

[Brian Johnson]

The command I am using: ffmpeg -i /dev/ctn91xx_mpeg0_0 -async 2
-acodec libmp3lame -ac 2 -vcodec libx264 -s 1280x720 -aspect 16:9 -f
mpegts file.ts

The file /dev/ctn91xx_mpeg0_0 is actually the device (Ceton InfiniTV
4) itself where it returns a mpeg transport stream, basically a named
pipe containing the raw audio and video.

When I run the command below, I get tons of errors which repeats forever:

ES packet size mismatch.0 size=     797kB time=00:00:04.23
bitrate=1541.1kbits/s dup=25 drop=0
[ac3 @ 0x8393340] frame CRC mismatch
[mpeg2video @ 0x834e680] ac-tex damaged at 0 28
[mpeg2video @ 0x834e680] ac-tex damaged at 2 1
[mpeg2video @ 0x834e680] ac-tex damaged at 0 27
[mpeg2video @ 0x834e680] ac-tex damaged at 0 29
[mpeg2video @ 0x834e680] Warning MVs not available
[mpeg2video @ 0x834e680] concealing 1276 DC, 1276 AC, 1276 MV errors
[mpegts @ 0x8287aa0] PES packet size mismatch
frame sync error 34 q=29.0 size=    1202kB time=00:00:05.76
bitrate=1709.0kbits/s dup=145 drop=0
Error while decoding stream #0:27
ac-tex damaged at 4 2929.0 size=    1383kB time=00:00:09.17
bitrate=1235.1kbits/s dup=145 drop=0
[mpeg2video @ 0x834e680] mb incr damaged
[mpeg2video @ 0x834e680] ac-tex damaged at 35 29
[mpeg2video @ 0x834e680] concealing 880 DC, 880 AC, 880 MV errors
[mpegts @ 0x8287aa0] PES packet size mismatch
[ac3 @ 0x8393340] frame CRC mismatch
[mpegts @ 0x8287aa0] PES packet size mismatch
    Last message repeated 1 times
[ac3 @ 0x8393340] frame sync error
Error while decoding stream #0:27
[mpeg2video @ 0x834e680] invalid cbp at 0 12
[mpeg2video @ 0x834e680] mb incr damaged
[mpeg2video @ 0x834e680] invalid mb type in B Frame at 3 24
[mpeg2video @ 0x834e680] 00 motion_type at 1 25
[mpeg2video @ 0x834e680] 00 motion_type at 0 26
[mpeg2video @ 0x834e680] invalid mb type in B Frame at 16 27

What is very interesting is that lower quality video transcodes (i.e.
320x240) has the same errors as above but only lasts about 1-2
seconds, and then output looks normal

frame= 1235 fps= 35 q=29.0 size=    1985kB time=00:00:39.53 bitrate=
411.2kbits/s dup=131 drop=0

I believe this to be related to
<https://lists.ffmpeg.org/pipermail/ffmpeg-user/2011-October/002584.html>
and in my own research, I found that this may have been a regression
from an older version, but again that is pure speculation on my part.

Any ideas? :)

- Brian