Hi Ronald
> > I tried with several input files, but always lav2yuv stops
> > at frame 18000 - 18100 around.
>
> What does lavinfo say about the file? Maybe we're breaking the 32bit
> limit in audio samples? IIRC, lav2yuv uses ints for audio sample
> counting...
>
Here we go...
lavinfo 07-scene7-mjpeg.avi
video_frames=18088
video_width=768
video_height=576
video_inter=0
video_norm=PAL
video_fps=25.000000
video_sar_width=0
video_sar_height=0
max_frame_size=201807
MJPG_chroma=2
has_audio=0
audio_bps=0
audio_chans=0
audio_bits=0
audio_rate=0
num_video_files=1
It's even getting more puzzling here. The file definitely HAS audio,
I can hear it in mplayer:
Playing 07-scene7-mjpeg.avi
Cache fill: 2.83% (237568 bytes) AVI file format detected.
AVI: ODML: Building odml index (2 superindexchunks)
VIDEO: [MJPG] 768x576 24bpp 25.000 fps 11836.2 kbps (1444.8
kbyte/s)
Clip info:
Software: MEncoder 1.0pre5-3.3.2
==========================================================================
Trying to force audio codec driver family libmad...
Opening audio decoder: [libmad] libmad mpeg audio decoder
AUDIO: 44100 Hz, 1 ch, 16 bit (0x10), ratio: 16000->88200 (128.0 kbit)
Selected audio codec: [mad] afm:libmad (libMAD MPEG layer 1-2-3)
==========================================================================
vo: X11 running at 1024x768 with depth 24 and 32 bpp (":0.0" => local
display)
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
[mjpeg @ 0x858f080]mjpeg: using external huffman table
Selected video codec: [ffmjpeg] vfm:ffmpeg (FFmpeg MJPEG decoder)
==========================================================================
Checking audio filter chain for 44100Hz/1ch/16bit ->
44100Hz/2ch/16bit...
AF_pre: af format: 2 bps, 1 ch, 44100 hz, little endian signed int
AF_pre: 44100Hz 1ch Signed 16-bit (Little-Endian)
AO: [oss] 44100Hz 2ch Signed 16-bit (Little-Endian) (2 bps)
Building audio filter chain for 44100Hz/1ch/16bit ->
44100Hz/2ch/16bit...
Starting playback...
VDec: vo config request - 768 x 576 (preferred csp: Planar YV12)
VDec: using Planar YV12 as output csp (no 3)
Movie-Aspect is 1.33:1 - prescaling to correct movie aspect.
VO: [xv] 768x576 => 768x576 Planar YV12 [zoom]
A: 3.0 V: 3.0 A-V: -0.000 ct: -0.001 75/ 75 23% 18% 2.8% 6 0 49%
also tcprobe says:
[tcprobe] RIFF data, AVI video
[avilib] V: 25.000 fps, codec=MJPG, frames=18088, width=768, height=576
[avilib] A: 44100 Hz, format=0x55, bits=0, channels=1, bitrate=128 kbps,
[avilib] 27697 chunks, 11576215 bytes, CBR
[tcprobe] summary for 07-scene7-mjpeg.avi, (*) = not default, 0 = not
detected
import frame size: -g 768x576 [720x576] (*)
frame rate: -f 25.000 [25.000] frc=3
audio track: -a 0 [0] -e 44100,0,1 [48000,16,2] -n 0x55 [0x2000]
(*)
bitrate=128 kbps
length: 18088 frames, frame_time=40 msec,
duration=0:12:03.520
But what I see here, is the length of 18088 frames reported by both
tcprobe and lavinfo. (?) But it's definitely longer.
When playing the mjpeg-file in mplayer, it counts up to 26266 frames!
A:1050.4 V:1050.6 A-V: -0.193 ct: 0.062 26266/26266 19% 11% 8.4% 0 0
0%%
Whats going on here?
Maybe there's s.th. wrong with the captured mjpeg-file?
I captured with both transcode (v4l-support) using ffmpeg codec and
mencoder using lavcodec.
So the problem is wrong information about the number of frames
in the header of the mjpeg-coded avi. Mjpegtools have nothing
to do with that. I should move to the v4l or ffmpeg lists.
You pushed me a step in the right direction, thanks for that.
Any hints how to repair this broken headers in already captured
files?
Greetings, Rainer.
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