[MPlayer-users] bug report: flash video (flv) video is out of sync

[David Liontooth]

Robert La Ferla wrote:
> When trying to playback some FLV (flash video) files, the video plays
> at a much faster rate than the audio (which plays at normal speed.) 
> This at least occurs on Mac OS X 10.4 (Intel) but I have yet to try it
> on other platforms.
Is the video playing faster, or is it just ahead of or behind the audio?
Does the a/v sync get progressively worse, or stay the same throughout?
You can use the - and + keys to adjust the sync -- my guess is that once
you get them in sync, they stay in sync.

Flash is known for having audio that is a second or two ahead of the
video. You can work around it in several ways -- use mplayer -delay, or
embed an audiodelay in the flashfile with flvtool2. If you want to
report it as a bug, you might request a default delay or some other more
elegant way to handle this.

If someone knowledgeable on flash would comment, that would be great.

Dave
>
> MPlayer dev-SVN-r22281-4.0.1 (C) 2000-2007 MPlayer Team
> CPU: Genuine Intel(R) CPU            1300  @ 1.66GHz (Family: 6,
> Model: 14, Stepping: 8)
> CPUflags:  MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
> Compiled for x86 CPU with extensions: MMX MMX2 SSE SSE2
>
> STREAM: [file] TestVideo.flv
> STREAM: Description: File
> STREAM: Author: Albeu
> STREAM: Comment: based on the code from ??? (probably Arpi)
> Checking for YUV4MPEG2
> ASF_check: not ASF guid!
> Checking for NuppelVideo
> Checking for REAL
> Checking for SMJPEG
> Searching demuxer type for filename TestVideo.flv ext: .flv
> Trying demuxer 35 based on filename extension
> LAVF_check: flv format
> libavformat file format detected.
> ==> Found video stream: 0
> ======= VIDEO Format ======
>   biSize 40
>   biWidth 320
>   biHeight 240
>   biPlanes 0
>   biBitCount 0
>   biCompression 827739206='FLV1'
>   biSizeImage 0
> ===========================
> ==> Found audio stream: 1
> ======= WAVE Format =======
> Format Tag: 85 (0x55)
> Channels: 1
> Samplerate: 22050
> avg byte/sec: 8000
> Block align: 0
> bits/sample: 16
> cbSize: 0
> ==========================================================================
>
> LAVF: 1 audio and 1 video streams found
> LAVF: build 3344896
> VIDEO:  [FLV1]  320x240  0bpp  29.970 fps    0.0 kbps ( 0.0 kbyte/s)
> [V] filefmt:35  fourcc:0x31564C46  size:320x240  fps:29.97  ftime:=0.0334
>
>
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