[Libav-user] X264 issue : Black Frame

Christophe Nelson cnelson at ina.fr
Wed May 29 15:55:47 CEST 2013

To add information to my last post, when I open it in MTS4ea (Tektronix measurement tool) I’ve got this message and can’t open the file :
No sequence_header_code found within 5242880 bytes of start position
Stream position: 0x0 (dec.0), bit 0
Bitstream context: []

I understand that there is a problem ;-) but that’s all

So, I need help to do a h264 video in a avi file and I would like to use the quantification control (CRF)

Hope someone help me

De : libav-user-bounces at ffmpeg.org [mailto:libav-user-bounces at ffmpeg.org] De la part de Christophe Nelson
Envoyé : vendredi 24 mai 2013 14:56
À : This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter.
Objet : [Libav-user] X264 issue : Black Frame


I’ve got a problem to play files encoded with x264. I ‘ve done this :
ffmpeg.exe -i InputFile -c:v libx264 -preset slow -crf 20 -c:a copy OutputFile.avi

When I read this file in VLC, GraphEdit, there’s no problem

But when I read it in VirtualDub, MSU quality measurement, avitoyuv.exe I have 5 black frames at the beginning !

I’m pretty sure I use FFDshow in all this software (exepted in VLC).

Could someone help me ? Do I need to install codecs ? Do I need to changed my ffmpeg command line ?


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