[FFmpeg-user] Mosaic issue when playing RMVB with ffmpeg

[Wang Xingchao]

Hi All,

i have uplaoded the test sample into upload.ffmpeg.org ftp:
/incoming/rmvb-mosaic-samples/mother-rmvb-mosaic-test.txt
/incoming/rmvb-mosaic-samples/mother-rmvb-mosaic-test.rmvb

thanks
--xingchao

2013/10/12 Wang Xingchao <wangxingchao2011 at gmail.com>:
> Hi Community,
>
> I met an weird issue on Mosaic when playing RMVB video files with ffmpeg.
> It's 100% reproduced when seek forward/backward, the mosaic video
> picture would last for ~4 seconds and recover back to normal playback.
>
> The issue is reproduced with below environments:
> - ffplay version 0.8
> - android + ffmpeg 1.13
> - play some particular rmvb files, not all rmvb files
>
> please note this issue doesnot occur with ffplay 2.0 on desktop.
>
> The audio codec type is "AAC" inside the rmvb test video file. The
> only workround for me is to disable audio with "-an" option, this will
> remove mosaic, and that's why i feel so weird.
>
> Here's the log message i met when playing the video with "ffplay", you
> can see audio decoding fails:
> "[aac @ 0x7fe188000e20] channel element 0.0 is not allocated=0/2   f=0/0
> [aac @ 0x7fe188000e20] SBR was found before the first channel element.
> [aac @ 0x7fe188000e20] channel element 0.13 is not allocated
> [aac @ 0x7fe188000e20] SBR was found before the first channel element.
> [aac @ 0x7fe188000e20] channel element 2.14 is not allocated
> [aac @ 0x7fe188000e20] channel element 2.12 is not allocated
> [rv40 @ 0x7fe188003260] First slice header is incorrect, ret=0, si.start 960
> [rv40 @ 0x7fe188003260] Invalid decoder state: B-frame without reference data.
> [rv40 @ 0x7fe188003260] warning: first frame is no keyframe
> [aac @ 0x7fe188000e20] channel element 0.0 is not allocated=0/42
> "
> Seems the audio packet damaged before sending to decoder, but how does
> that has impact on video playback?
>
> Another clue is about av_seek_frame(), it may seek to wrong positioin
> with audio enabled, that make video packets damaged too, but i'm not
> sure about that.
>
> I need more guide on such mosaic issue, any comments would be appreciated.
>
> thanks
> --xingchao