1
vote
2answers
260 views

Appending MP4s loses sound from second file

When I try to join two MP4s together using ffmpeg, the first file plays fine and has sound, but the second one loses all sound and becomes a lot choppier. I encoded both the files from MKVs using ...
0
votes
1answer
203 views

How to reduce audio duration for AC3?

I have an MKV (an Italian version). I have extracted the H264 and the unwanted (Italian) AC3 audio. Now, I'd like to remux it with an English audio track (I have). The problem is, the English track ...
4
votes
1answer
1k views

How to embed an audio and a subtitle file into a MKV file

I have a MKV file in which I want to embed an AC3 audio file. I also want to embed a SRT subtitle file into it. How can I achieve that? Note: AC3 file is the same length of the original video.
2
votes
1answer
2k views

mkvmerge error “formats do not match” when appending oga files

we're using mkvmerge to concat user uploaded audio into a single file (this is all done from code in a django website). The command line looks like mkvmerge -o /path/to/output.webm -w ...
1
vote
1answer
300 views

ffmpeg kills my audio stream

i am converting a bunch of avi videos to mkv, using simply ffmpeg -i "foo.avi" "foo.mkv". Now i have the problem, that in my output-mkv-file exists one video stream (fine) but only the first audio ...
5
votes
3answers
8k views

How to adjust .mkv files audio volume level?

I have a bunch of .mkv video files which audio is REALLY low volume. How can i adjust the volume higher permanently in the .mkv file? preferrably with lossless methods (if even possible?). Yes, i ...
0
votes
2answers
414 views

How to convert an MKV file without crackling

I'm trying to convert an MKV file to AVI format. I've tried different settings and there is always a slight crackling in the background. Why does this happen? How can I convert an MKV file to a ...
1
vote
1answer
1k views

playing Matroska (.mkv) files via Windows Media Center - no audio

I'm looking to play my .mkv files via Windows Media Center - I've got it almost working. They show up on the menu, they play video fine, but the audio is mute. Strangely, if I play the .mkv file via ...