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Encoded video is black

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Jeremy Heintz
Encoded video is black
on Dec 21, 2011 at 12:03:30 am

Hey all,
I am trying to wade my way through the expanse of ffmpeg, but am running in to a block. I am working with Podcast Producer where I am encoding the raw footage (.mov) using ffmpeg (libx264). However after encoding the result video is black (no audio either). The input files are of various sizes (10-500MB) and are all .mov. The command I am using is:

ffmpeg -y -i INPUT.mov -an -vcodec libx264 -vpre fast_firstpass -b 2000k -bt 2000k -deinterlace -pass 1 -threads 4 OUTPUT.m4v && ffmpeg -y -i INPUT.mov -ab 320k -acodec aac -strict experimental -vcodec libx264 -vpre fast -b 2000k -bt 2000k -deinterlace -pass 2 -threads 4 OUTPUT.m4v

This command seems to work well with smaller files ( ~150 MB or less), however with larger files it results in a black movie. Should any values be changed based on input file size? Anything I should change with my command?

Thanks so much!


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stephen dixon
Re: Encoded video is black
on Dec 28, 2011 at 12:28:00 pm

What does ffmpeg report when you try to encode the unsuccessful files? Are there any error messages?

BTW: Is there a reason you're using aac instead of libfaac?


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Jeremy Heintz
Re: Encoded video is black
on Dec 29, 2011 at 5:00:40 pm

It's my understanding that libfaac has been removed from ffmpeg. If it is currently still supported, but detached, how can I install/use it?

Regarding my original problem, there are no errors in the console. I doing this through Podcast Producer, and generally when there is an encoding issue the whole job fails. However with this, the job is "successful" and uploads a black video. Is there anything I should be looking for specifically? Or anything to try?


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stephen dixon
Re: Encoded video is black
on Mar 4, 2012 at 2:22:38 am

go to http://www.audiocoding.com/faac.html for the source. You may need to get dependencies and they may have dependencies and so on. Make a small sacrifice to your choice of deity and compile.

As far as your black video goes, well I'm stumped. Have you tried running ffmpeg from the command line?


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