[vlc-devel] Re: vlc on amd64 -- problems with mencoder's h264 and flash movie files

David Liontooth liontooth at cogweb.net
Sun Mar 12 23:22:02 CET 2006

Should I just give up trying to report VLC bugs? I've been trying for a
month on the web forum (following the posted instructions), and now
here.  This is an obvious bug, I'm happy to produce samples, it happens
consistently, it's reasonably well defined. Is anybody interested in VLC
on amd64?

In a decent reporting setup, I'd just go into a bug database and report
it, but in VLC you have to get the attention of some developer to do it,
and frankly the system is not working.  What do I do to get this
reported? It would be great if someone had time to actually look into it
and fix the problem, but at least provide some way for people to report!


David Liontooth wrote:

>I've been running VLC on amd64 for a while with excellent results, and
>I've come across two problems that occur on this platform but not on i386.
>First, h264 files produced with mencoder don't display properly -- the
>picture is full of blocks to the point of looking milky (I can send pics
>or make samples available).
>Second, flv (flash movie) files produced with mencoder don't even open
>(debug below).
>In both cases, the files play flawlessly on ffplay and mplayer on amd64.
>In addition, both types of files play perfectly with the latest (nightly
>build) VLC on the i386 platform.
>Finally, VLC on amd64 will play h264 files encoded using ffmpeg with no
>problems -- I've been serving these for weeks from my amd64.
>In sum, this appears to be a bug specific to VLC on amd64, triggered
>only when the files are encoded by mencoder. In the case of flash, the
>problem may be more general; I haven't yet tested ffmpeg-encoded flash
>files on amd64.
> -- the h264 files are encoded as follows, on amd64:
>mencoder input.avi -o /dev/null -oac copy -ovc x264 \
>-x264encopts pass=1:bitrate=500:bframes=3:subq=2:threads=2
>mencoder input.avi -o name-h264-500.avi -oac mp3lame -lameopts cbr:br=64
>-ovc x264 \
> -- the flash files are encoded as follows, on amd64:
>mencoder AShort.avi -o output.flv -of lavf -oac mp3lame -lameopts
>abr:br=56 -ovc lavc \
>-lavfopts i_certify_that_my_video_stream_does_not_use_b_frames \
>-lavcopts vcodec=flv:vbitrate=500:mbd=2:mv0:trell:v4mv:cbp:last_pred=3
>-srate 22050
>Tested with VLC from 0.8.4 to today's nightly build, on several
>different boxes with Debian sid i386 and amd64.
>Here is vlc 0.8.5-svn20060312-0 attempting to play output.flv:
>[00000273] main playlist debug: creating new input thread
>[00000461] main input debug: waiting for thread completion
>[00000461] main input debug: `output.flv' gives access `' demux `' path
>[00000461] main input debug: creating demux: access='' demux=''
>[00000462] main demuxer debug: looking for access_demux module: 2 candidates
>[00000461] main input debug: thread 1124096352 (input) created at
>priority 0 (input/input.c:260)
>[00000461] main input debug: creating access '' path='output.flv'
>[00000463] main access debug: looking for access2 module: 5 candidates
>[00000463] vcd access debug: trying .cue file: output.cue
>[00000463] access_file access debug: opening file `output.flv'
>[00000463] main access debug: using access2 module "access_file"
>[00000464] main private debug: pre buffering
>[00000464] main private debug: received first data for our buffer
>[00000461] main input debug: creating demux: access='' demux=''
>[00000465] main demuxer debug: looking for demux2 module: 43 candidates
>[00000465] vobsub demuxer debug: this doesn't seem to be a vobsub file
>[00000465] ps demuxer warning: this does not look like an MPEG PS
>stream, continuing anyway
>[00000465] main demuxer debug: using demux2 module "ps"
>[00000461] main input debug: looking for a subtitle file in
>[00000461] main input debug: `output.flv' successfully opened
>[00000465] ps demuxer warning: garbage at input, trying to resync...
>[00000461] main input debug: EOF reached
>[00000461] main input debug: closing input

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