[FFmpeg-user] Display statistics on decode error

[Carl Eugen Hoyos]

Am Do., 8. Aug. 2019 um 10:56 Uhr schrieb Remi Achard <remiachard at gmail.com>:
>
> Hi,
>
> I would like to use ffmpeg to check video files integrity in the sense that
> every frame can be successfully decoded.
>
> The command line I’m using looks like this :
> ffmpeg -v error -xerror -i /my/video/path -f null -
>
> It works but don’t give any clue on where the error was in the stream.
>
> [prores @ 0x7f9761812e00] invalid plane data size
>     Last message repeated 78 times
> /my/video/path: corrupt decoded frame in stream 0
>
> Ideally, I want to know at what frame the error occurred, to do this I
> proposed a patch (
> http://ffmpeg.org/pipermail/ffmpeg-devel/2019-July/246498.html), that seems
> to work ok. The idea is to only show where the decoding failed without
> printing each and every frame statistic along the way (to keep reports and
> buffer from overflowing). The command looks like this (notice the verbose
> log level because the final statistics are logged as verbose level) :
>
> ffmpeg -v verbose -xerror -i /my/video/path -f null -
>
> [prores @ 0x7fc1dc007c00] ac tex damaged 2049, 2048
> [prores @ 0x7fc1dc007c00] invalid plane data size
>     Last message repeated 78 times
> /my/video/path: corrupt decoded frame in stream 0
> video:1034kB audio:7810kB subtitle:0kB other streams:0kB global headers:0kB
> muxing overhead: unknown
> Input file #0 (/my/video/path):
>   Input stream #0:0 (video): 1976 packets read (1648274256 bytes); 1975
> frames decoded;
>   Input stream #0:1 (audio): 3997 packets read (11995584 bytes); 3997
> frames decoded (3998528 samples);
>   Input stream #0:2 (audio): 48 packets read (147072 bytes);
>   Input stream #0:3 (data): 0 packets read (0 bytes);
>   Total: 6021 packets (1660416912 bytes) demuxed
> Output file #0 (pipe:):
>   Output stream #0:0 (video): 1975 frames encoded; 1975 packets muxed
> (1058600 bytes);
>   Output stream #0:1 (audio): 3997 frames encoded (3998528 samples); 3997
> packets muxed (7997056 bytes);
>   Total: 5972 packets (9055656 bytes) muxed
> [AVIOContext @ 0x7fc1dd800080] Statistics: 1687982697 bytes read, 1827 seeks
> Conversion failed!
>
> With this I know that error occurred near frame 1975.
>
> Is there a way to already achieve this with ffmpeg-master ?

You can either use -debug_ts or write the console output into a file
where the error message will be embedded between the status lines.

Another alternative is of course to use your patch...

Carl Eugen