Le 15/10/2012 11:26, Chandranath Bhattacharyya a écrit :
Hi All,
I downloaded windows ffmpeg build from
http://ffmpeg.zeranoe.com/builds/. The build downloaded is
ffmpeg-20121009-git-f3f35f7-win32-shared.7z &
ffmpeg-20121009-git-f3f35f7-win32-dev.7z.
I built "examples/demuxing.c" using Visual Studio 10 on windows.
However, it's not working. When invoked with command line: <exename>
output.mp4, it's exiting with the following errors:
[mp4 @ 00582ea0] Encoder did not produce proper pts, making some up.
[mp4 @ 00582ea0] pts (0) < dts (1) in stream 0
Error while writing video frame
I figured out that av_interleaved_write_frame is failing because a
call to avcodec_encode_video2 is not changing
AVCodecContext::coded_frames->pts. It's always 0, and hence
AVPacket.pts is 0. However the call to avcodec_encode_video2 is
increasing the AVPacket.dts value from -2, -1, 0, 1. So in 4^th call
to av_interleaved_write_frame, AVPacket.pts < AVPacket.dts causing the
issue.
I made some code changes to ensure that pts > dts, and then the file
was written. However when opened in Windows Media Player Classic, the
file is showing a frame rate of 12800.
I was using following. Modified STREAM_DURATION to 10.0 from 200.0.
#defineSTREAM_DURATION 10.0
#defineSTREAM_FRAME_RATE 25 /* 25 images/s */
#defineSTREAM_NB_FRAMES ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
With these parameters,AVStream::codec->time_base = { num: 1, den: 25},
but just after call toavformat_write_header, the AVStream::time_base =
{ num: 1, den: 12800 }.
What's going wrong?AVStream::time_base.den = 12800; seems to be wrong
data. Other than fixing some compilation errors, I did not modify
anything else in examples/demuxing.c.
Regards,
Chandranath
It seems i've got the same troubles since the 3 last zeranoe packages.
Previous ones were ok, but last 3 gives 12800 fps frame for .mp4 rate
and i've got some others troubles like that with other encoders /
containers...
So i'm very interested in an answer to this question too !
And as a bonus question : Should be set .pts for each frame to a correct
value for the encoder and for the container or can we keep AV_NOPTS_VALUE ?
regards
Stephane
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