Ubuntu – Is it possible to convert only audio in video file using avconv

ac3avconvavi

I have downloaded a video file in AVI format and it seems to have A52 (AC3) encoded audio. VLC for iOS can't play this audio format.

Can I convert audio of this video file to AAC or something more standard across Linux and iOS? How should I go about this?

Extract audio from video. Convert audio to standard format. Merge it back.

Can avconv directly convert audio without me needing to extract it first?

Best Answer

After playing with avconv myself, I found a possible solution.

avconv -i inputfile.avi -strict experimental -c:a aac -c:v copy outputfile.mp4

However I tested the file and it worked on iOS 8.1, I have not played it in full to be sure. I will update later.

Related Solutions

Ubuntu – Avconv ac3 to aac or mp3 is not synced with video

To sync the audio stream with video time stamps we may use the -async option:

-async samples_per_second
Audio sync method. "Stretches/squeezes" the audio stream to match the timestamps, the parameter is the maximum samples per second by which the audio is changed. -async 1 is a special case where only the start of the audio stream is corrected without any later correction. This option has been deprecated. Use the asyncts audio filter instead.
^{Libav documentation}

Begin to try with samples per second matching your framerate and decrease until your audio is in sync:

avconv -async 30 -i <infile> <encoding options> -r 30 <outfile>

Ubuntu – Converting from mp4 to Xvid avi using avconv

with several pass, you should deactivate audio on pass 1, with the -an option, so :

avconv -y -i video.mp4 -pass 1 -vtag libxvid -an -b:v 1500k -f avi /dev/null

Best Answer

Related Solutions

Ubuntu – Avconv ac3 to aac or mp3 is not synced with video

Ubuntu – Converting from mp4 to Xvid avi using avconv

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