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

[dE .]

On 03/02/12 00:37, Brian Johnson wrote:
> 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
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> ffmpeg-user at ffmpeg.org
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Are you using the latest? This may be cause your PC is not as fast. Try 
using -threads and -preset ultrafast.