[MPlayer-users] Some issues in FLV encoding

Alexander Bokovikov openworld at uralweb.ru
Sun Feb 24 18:46:37 CET 2008

Hi, All,

As I've found, MEncoder can't encode FLV with audio in synch. I get a good 
video if I use "-noaudio" option while encoding, but I get a video, running 
at higher rate with normal audiotrack if I use audio encoding in parallel 
with the video encoding. The source file is MOV, produced on Mac. Other 
formats also gave several problems if I tried to encode audio + video at one 
pass. Maybe I'm doing something incorrectly? I used several versions upto 
February SVN's with more or less the same result.

Then I've tried to encode FLV in three passes:

1. mute video FLV production
2. MP3 audio production
3. MP3 embedding into FLV, containing video.

Unfortunately I can use MEncoder at pass 1 only, because I don't know, how 
to create audio-only files like MP3 using it. Also I don't know if it is 
possible to add MP3 track into FLV, using MEncoder. Therefore now I use 
other tools for steps 2 and 3. Step 2 now requires Windows codecs usage, 
what limits this solution. For example MOV files are not processed if 
QuickTime is not installed.

Does anybody know how to create audio-only file with MEncoder? I've tried to 
use "-vcodec frameno" option, but it produces wrong (incomplete) audiotrack, 
because it processes source file at video framerate, which is detected 
incorrectly. Therefore video reaches its end, while audio is yet not 
finished, but MEncoder closes both streams as soon as video reaches its end.

Any advice would be appreciated.

Thank in advance.

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