| Author |
Message |
marcio.sfs
Member
Joined: 05 Jun 2007
Location: Brazil
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Hello.
Converting movies to h264 some files is creating videos that beggins with whited frames.
I try converting the original to others formates to then generate h264, and the same problem occur.
Some idea ???
Thaks.
Márcio
Brazil, SP
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tekkieman
Grizzled
Joined: 23 Mar 2004
Location: Over the hill
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Could you provide some information on the types of files you are converting? What are you using to convert to h264? FFMPEG? What version? How many white frames are you getting? When this happens, is the audio still in sync?
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marcio.sfs
Member
Joined: 05 Jun 2007
Location: Brazil
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Yeah, this is the command line I use:
| Code: |
| ffmpeg -i origem/1910_1962/2007-05-21-infamous.mov -vcodec h264 -s 320x174 -b 400k -r 48 -acodec mp3 -ar 22050 -ab 56 med/2007-05-21-infamous.mov |
IdVid gives the following informations:
| Code: |
File: origem/1910_1962/2007-05-21-infamous.mov
Width: 480 pixels
Height: 260 pixels
Aspect ratio: 1.33:1
Frames: 0
Duration: 00:02:21 hours/mins/secs
Framerate: 24.000 frames per second
Video format: avc1
Video bitrate: 0 bits per second
---------------------------
Audio track 1 (Stream 0.0, AID 0):
---------------------------
Codec: aac
Bitrate: Stream #0.0(eng): Audio: aac, 44100 Hz, stereo000 bits per second
Sampling rate: 44100 Hz
=========================================================
Audio is compliant with the following formats:
Not compliant with (S)VCD or DVD
Video is compliant with the following formats:
Not compliant with (S)VCD or DVD
This video does not seem to be compliant with (S)VCD or DVD
standards. If you burn it to a video disc, it may not work.
========================================================= |
The Ffmpeg version is SVN-r7813.
This problem happens in the beggin of the video file, and audio is OK.
Ffmpeg outputs a set of this lines:
| Code: |
| [h264 @ 0x39318f50d0]OVERFLOW levelcode=4101 |
How much more lines, more whited frames.
Original file: http://www.cineclick.com.br/video_help/perfect_original_file.mov
Generated file: http://www.cineclick.com.br/video_help/whited_generated.mov
Thanks for helping 
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GMaq
Linux Member
Joined: 17 Mar 2004
Location: Canada
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Hi,
I've had similar issues encoding H.264 with ffmpeg, I finally traced it back to the quantizer settings. In your command line you have not specified a qmin or a qmax. H.264 or at least x264 which ffmpeg uses has a a range from -qmin 2 to -qmax 51. I found that increasing the qmin to a value of 10 stopped the overflows and retained excellent quality. Try adding -qmin 10 -qmax 51 to your command line and see if it helps. It eliminated the problem for me.
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marcio.sfs
Member
Joined: 05 Jun 2007
Location: Brazil
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The problem was sucessfully fixed.
Thanks a lot.  
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