I am trying to convert an MKV file to MP4 to be compatible with my PS3. I am using:

avconv -i file.mkv -c copy file.mp4

It fails and I get the following error:

[mp4 @ 0x8a17c00] pts < dts in stream 0
av_interleaved_write_frame(): Invalid argument

The file is h264 video and ac3 audio.

  • This question may give you some pointers. See answer #2 Jan 15, 2013 at 21:21
  • That question is where I originally found how to do the conversion. There is no mention of errors though. Thanks anyway. Jan 17, 2013 at 14:21
  • 1
    After much trial and error i got it to work using: avconv -i file.mkv -c:v copy -c:a copy file.mp4 Jan 17, 2013 at 15:20

4 Answers 4


Get needed software

sudo apt-get install gpac mkvtoolnix

Extract video and audio from matroska file

First you need to check what tracks the matroska file contains with

mkvmerge --identify video.mkv

File 'video.mkv': container: Matroska
Track ID 1: video (V_MPEG4/ISO/AVC)
Track ID 2: audio (A_AC3)

Then extract video and audio according to their tracks with:

mkvextract tracks video.mkv 1:video.h264 2:audio.ac3

Extracting track 1 with the CodecID 'V_MPEG4/ISO/AVC' to the file 'video.h264'. Container format: AVC/h.264 elementary stream
Extracting track 2 with the CodecID 'A_AC3' to the file 'audio.ac3'. Container format: Dolby Digital (AC3)
Progress: 100%

Mux audio and video into mp4 containter

MP4Box -fps 24 -add video.h264 -add audio.ac3 video.mp4

AVC-H264 import - frame size 1280 x 720 at 24.000 FPS
Import results: 31671 samples - Slices: 5672 I 125048 P 122648 B - 32288 SEI - 4936 IDR
AC3 import - sample rate 48000 - 6 channels
Saving to video.mp4: 0.500 secs Interleaving

I had to add -fps 24 option because MP4Box didn't detect video fps correctly. Depending on usage AC3 audio track should be re-encoded into something else before muxing.

Now you have remuxed streams from matroska container into mp4 container without losing any quality.

EDIT: MP4 doesn't officially support AC3 audio so the audio track should be converted into a supported format (eg. AAC, MP3) if you want the file to be playable with something else than VLC.


I believe that

avconv -i file.mkv -c:v copy -c:a copy file.mp4

is the correct command. You need to specify the codec copy property for the streams you want to copy separately.

  • That should be correct. At least that you need to specify video and audio codec. If -c:a is not accepted -codec:a and -acodec should work, same goes for video.
    – LiveWireBT
    Dec 11, 2013 at 6:02

I was looking for muxing mp4 along with m4a. The usual ffmpeg commands for encoding didn't worked.Tried MP4Box & it worked like a charm. :-)


You can use winff-gtk2 it solved my the problem! To install:

sudo apt install winff-gtk2

  • 1
    avconf is dead for a very long time. Still, winff is based on ffmpeg , not on avconf. And the question was about avconf (which never did it get quiet right) . ffmpeg is back for long time now...
    – kanehekili
    Jul 21, 2020 at 22:05

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