Detect Invalid Video File

[MysteryX]

I have written code that encodes videos in several segments and then merges at the end. It works fine *AS LONG AS* any segment is terminated cleanly. If you kill any of the FFMPEG processes, however, the merge will result in undefined behaviors.

How can I detect whether a video file is valid to prevent such undefined behavior? Is there any way to recover parts of an invalid file to make it valid, perhaps by discarding the end?

Thanks

[StainlessS]

Recover Parts: Just do a remux in ffmpeg and it should chop off crap at the end.

Remux to MKV,


setlocal

REM Where to Find ffmpeg
set FFMPEG="C:\BIN\ffmpeg.exe"

REM Where to get input file, No terminating Backslash, "." = current directory
set INDIR="."


REM Where to place output file, No terminating Backslash.
set OUTDIR=".\OUTPUT"


FOR %%A IN (*.wmv *.mpg *.avi *.flv *.mov *.mp4 *.m4v *.RAM *.RM) DO (
%FFMPEG% -i "%INDIR%\%%A" -vcodec copy -acodec copy "%OUTDIR%\%%~nxA.MKV"

)

Pause


It dont like SPACE's in names.

EDIT: Maybe RaffRiff can comment on ffProbe use for error detection (Usually comes with full ffmpeg package).

[MysteryX]

Remux is a good idea, it should work.

I however only want to do it if it is necessary -- how to know that?

[MysteryX]

In terms of terminating FFMPEG cleanly, I just found something. I run AVS2YUV and pipe it to FFMPEG; and now can run 4 instances in parallel. Killing FFMPEG gives an invalid file. Soft killing all 4 instances takes considerable time. If I hard kill the 4 instances of AVS2YUV, however, that stops immediately and FFMPEG still finishes writing its file :)

If someone kills a FFMPEG process manually, however, I still have no way of knowing the file is bad.