Thank for your answer. I just tried what you have said for several times.
But the result seems really odd.
when my input file is a "ED_1024.avi: RIFF (little-endian) data, AVI" file,
I demux it into video file and a audio file.
ED: MPEG sequence, v4, video, simple @ L1
EDD: ATSC A/52 aka AC-3 aka Dolby Digital stream, 48 kHz,, complete main
(CM) 3 front/2 rear, LFE on,, 448 kbit/s reserved Dolby Surround mode
That is just what I want.
But when this come to a .mp4 file:
"1.mp4: ISO Media, MPEG v4 system, version 2" which also contain the same
mpeg4 and audio.
Seems stream 0 codec frame rate differs from container frame rate: 30000.00
(30000/1) -> 15.00 (15/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp423gp4isom
Duration: 00:02:57.63, start: 0.000000, bitrate: 813 kb/s
Stream #0.0(und): Video: mpeg4, yuv420p, 352x288 [PAR 1:1 DAR 11:9], 763
kb/s, 13.50 fps, 15 tbr, 30k tbn, 30k tbc
Stream #0.1(und): Audio: aac, 16000 Hz, mono, s16, 48 kb/s
The video become(not a video any more):
"1.mpeg4: data " using file command under linux
and
"Input #0, mp3, from '1.mpeg4':
Duration: 00:28:15.50, start: 0.000000, bitrate: 80 kb/s
Stream #0.0: Audio: mp2, 24000 Hz, 2 channels, s16, 80 kb/s"
with ffmpeg -i 1.mp4
I don't understand what's the difference. Thx.
2010/11/10 Tomas Härdin <[email protected]>
> On Wed, 2010-11-10 at 11:31 +0800, cheng chen wrote:
> > Hi,all
> > I am try to use hardware to decode the stream of "mpeg4/h264/vc1/h263".
> > Since I just want to get the stream out of the video container, no
> further
> > decode, I find that in struct AVStream there is an element call "int
> > stream_copy" and I find several
> > av_encode()<http://ffmpeg.org/doxygen/0.5/ffmpeg_8c-source.html#l01548>
> > , new_video_stream()<
> http://ffmpeg.org/doxygen/0.5/ffmpeg_8c-source.html#l02984>
> > , print_report()<
> http://ffmpeg.org/doxygen/0.5/ffmpeg_8c-source.html#l01051>,
> > and read_ffserver_streams()<
> http://ffmpeg.org/doxygen/0.5/ffmpeg_8c-source.html#l00442>.
> > functions. But I have no idea which function should I use.
> > Can anyone give any suggestions? Thx!
>
> Just open the file using av_open_input_file() and av_find_stream_info(),
> then read packets using av_read_frame(). Just check stream_index of the
> packets to get the video ones.
>
> /Tomas
>
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>
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