encoding with mencoder

[lrudor]

First post on ubuntu forums, great os I must admit ;)
here is my issue:
I am attempting to re-encode a video with mencoder on ubuntu 8.04 (64 bit if it matters) from mkv to mp4

so I extracted the h264 and audio streams from the mkv
changed "67 64 00 33" to "67 64 00 29" using hexedit, no problems

I then re-encode the video to something smaller:


mencoder "/videos/toencode/test.h264" -o "/videos/encoded/test.temp.264" -passlogfile "/videos/encoded/test.temp.log" -vf scale=848:480 -nosound -ovc x264 -x264encopts bitrate=1200:frameref=8:bframes=3:b_adapt:b_pyrami d:weight_b:partitions=all:8x8dct:me=umh:subq=6:tre llis=2:brdo:threads=auto:pass=1:analyse=all -ofps 23.976


and


mencoder "/videos/toencode/test.h264" -o "/videos/encoded/test.temp.264" -passlogfile "/videos/encoded/test.temp.log" -vf scale=848:480 -nosound -ovc x264 -x264encopts bitrate=1200:frameref=8:bframes=3:b_adapt:b_pyrami d:weight_b:partitions=all:8x8dct:me=umh:subq=6:tre llis=2:brdo:threads=auto:pass=2:analyse=all -ofps 23.976


ok, spends about 1 hour doing that. no problem

I use encode the audio using neroAacEnc

now here is where I start getting issues:


MP4Box -fps 23.976 -add test.264 -add audio.mp4 output.mp4


mp4 box:


Cannot find H264 start code
Error: BitStream Not CompliantError importing test.264: BitStream Not Compliant


I have been looking for 2 days on how to solve this issue, but have not come across anything on how to fix this. if someone could tell me what I am doing wrong that would be great ^^. (I can play the video fine in vlc so I don't know why MP4Box hates it so much...)

Thanks for your help :D

[eye208]

so I extracted the h264 and audio streams from the mkv
No need to do that. MEncoder can read MKV files too.

changed "67 64 00 33" to "67 64 00 29" using hexedit, no problems
What was that for?

now here is where I start getting issues:


MP4Box -fps 23.976 -add test.264 -add audio.mp4 output.mp4


mp4 box:


Cannot find H264 start code
Error: BitStream Not CompliantError importing test.264: BitStream Not Compliant


I have been looking for 2 days on how to solve this issue, but have not come across anything on how to fix this. if someone could tell me what I am doing wrong that would be great ^^.
The .264 extension makes MP4Box expect a raw H.264 bitstream. By default the output of MEncoder will always be AVI unless you specify something else using the -of option. For raw stream output use "-of rawvideo".

Of course there is no need to do all the encoding again. MP4Box has an option to extract bitstreams from AVI files.

[lrudor]

No need to do that. MEncoder can read MKV files too.
ok, will have to try that.

What was that for?

No idea, I read that it was needed in order to change from mkv to mp4


The .264 extension makes MP4Box expect a raw H.264 bitstream. By default the output of MEncoder will always be AVI unless you specify something else using the -of option. For raw stream output use "-of rawvideo".

Of course there is no need to do all the encoding again. MP4Box has an option to extract bitstreams from AVI files.

ok, will have to re-encode it with the "-of rawvideo" command and see how it goes.

Thanks for your help.

[eye208]

ok, will have to re-encode it with the "-of rawvideo" command and see how it goes.
I just said there is no need to re-encode.

Your existing file "test.264" is an AVI file. You can use MP4Box to extract the raw H.264 bitstream from it and put that into an MP4 container.

[lrudor]

Sorry, I was re-encoding to get to a smaller file size.

and when I try and just do the mkv file directly Mencoder gives me a segmentation fault.

[Railsbuntu]

Can someone write down the steps to do that, I don't understand anything at all. I have encoded a file with mencoder using x264, the file is output.avi

I extracted the video and audio with mplayer to output.h264 and output.aac, now trying to remux them in an mp4 file using mp4box gives me the error message: Error importing output.h264: BitStream Not Compliant

So what to do now that I have all these files?

EDIT: it seems mplayer doesn't seem to produce valid streamsn when demuxing: http://forum.doom9.org/showthread.php?t=102064

Can I use mp4box to do that instead then remux after?