[MEncoder-users] Audio/Video desync during conversion by mencoder

[belcampo]

Andrey Voropaev wrote:
> Hello!
> 
> Sorry, I'm complete newbie in the area of video, all I wanted is to
> make video file small enough to play on my PDA.
> 
> Original size was 700x404 and I wanted to reduce it to 400x230. First
> I tried to use command
> 
> mencoder -o converted.avi -oac copy -ovc copy -vf scale=400:-2 original.mkv
> 
> It failed with the error
> 
> Audio format 0x73627276 is incompatible with '-oac copy', please try
> '-oac pcm' instead or use '-fafmttag' to override it.
> 
> Then I've tried
> 
> mencoder -o converted.avi -oac lavc -ovc lavc -vf scale=400:-2 original.mkv
> 
> During conversion there was lots of skipped frames. The conversion
> ended with the message
> 
> Too many audio packets in the buffer: (4101 in 932920 bytes).
> Maybe you are playing a non-interleaved stream/file or the codec failed?
> For AVI files, try to force non-interleaved mode with the -ni option.
> 
> In the resulting file the audio was well behind video. Option -noskip
> didn't help. What would be the proper way to convert the file?
> 
> When playing original file mplayer reports the following
> 
> [mkv] Track ID 1: video (V_MPEG4/ISO/AVC) "Spice and Wolf: Wolf and
> Distant Past", -vid 0
> [mkv] Track ID 2: audio (A_VORBIS) "2ch Vorbis", -aid 0, -alang jpn
> [mkv] Track ID 3: subtitles (S_TEXT/ASS) "Styled Subtitles", -sid 0, -slang eng
> [mkv] Will play video track 1.
> Matroska file format detected.
> VIDEO:  [avc1]  704x400  24bpp  23.976 fps    0.0 kbps ( 0.0 kbyte/s)
> [ass] auto-open
> [ass] Init
> [ass] Updating font cache.
> ==========================================================================
> Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
> Selected video codec: [ffh264] vfm: ffmpeg (FFmpeg H.264)
> ==========================================================================
> ==========================================================================
> Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
> AUDIO: 48000 Hz, 2 ch, s16le, 0.0 kbit/0.00% (ratio: 0->192000)
> Selected audio codec: [ffvorbis] afm: ffmpeg (FFmpeg Vorbis decoder)
> ==========================================================================
> AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)
> Starting playback...
> VDec: vo config request - 704 x 400 (preferred colorspace: Planar YV12)
> VDec: using Planar YV12 as output csp (no 0)
> Movie-Aspect is 1.76:1 - prescaling to correct movie aspect.
> VO: [xv] 704x400 => 704x400 Planar YV12
> 
> Would appreciate any help!
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Besides your question, will your PDA be able to decode avc1 stuff at a 
bitrate which was presumably intended to play on tv/computer-screen ?
I think you 1st need to investigate what your PDA can play, not only 
screensize.