从传输流中提取音频并保留长度

Question

I'm using ffmpeg to extract audio from MPEG Transport Stream file recorded by DVB-S card. The command:

ffmpeg -i video.ts -vn audio.wav

The source file seems to be corrupted. I noticed the corruption happens from time to time, especially for videos longer than 1 hour. I've got errors like these:

[mp2 @ 0x1bb5500] Header missing
Error while decoding stream #0:1
[mpegts @ 0x17eaf40] Continuity check failed for pid 5261 expected 2 got 6

The problem is that the resulting audio.wav is shorter than the source video (40m33s and 40m59s accordingly). I'm looking for the way to preserve the original length in the resulting audio file.

I tried the recent ffmpeg under Windows and avconv under Ubuntu, output format was MP3 and WAV. For every case I've got the same results.

Answer 1

I didn't find whether it's possible to do it with ffmpeg however I found ProjectX - a tool which tries to fix the broken TS stream. Website: http://project-x.sourceforge.net/

With:

java -jar ProjectX.jar -demux my_video.ts

the stream is demuxed into audio and video files which are guaranteed to have the same length. I simply mux them back using ffmpeg.