I experience the same accelerated playback, both with elementary streams demuxed by ffmpeg as well as x264 itself.
Something else I noticed in the output file in both cases is that its frame rate gets set to variable, although that patently wasn't the case for input files I tested with, and there were no command line options influencing frame rate. In the case of x264, the --fps <framerate> option seems to solve the problem, with <framerate> set to that of the input file. I haven't tested with ffmpeg. On 30 October 2014 13:32, Shashank Pathak <shashank.pat...@einfochips.com> wrote: > Hi All, > > We are having one mp4 file with h264 codec. > we want to feed this file to a video decoder but the decoder requires > elementary stream. > So we tried to extract H264 elementary string from mp4 with below ffmpeg > commnd, > > ffmpeg -i input.mp4 -vcodec copy -vbsf h264_mp4toannexb output.h264 > > Now with this command we are getting h264 file but this file is not having > I-frame in it. > We viewed the file in Hex editor and found that it contains, > 00 00 00 01 67 --> SPS frame > 00 00 00 01 68 --> PPS frame > But we couldn't find, > 00 00 00 01 65 --> I-frmae. > > VLC is not able to play the generated h264 file. > ffplay plays the file but very fast (higher fps). > > Can anyone suggest what we are doing wrong? > or Any other method to get H264 file? > > -- > Best Regards, > Shashank Pathak > Senior Engineer | PES > > [cid:part1.05050907.05040709@einfochips.com] > Product Engineering Services > Software | Embedded | Semiconductor > > Frost & Sullivan Company of the Year 2013-14 > ************************************************************************************************************************************************************* > eInfochips Business Disclaimer: This e-mail message and all attachments > transmitted with it are intended solely for the use of the addressee and may > contain legally privileged and confidential information. If the reader of > this message is not the intended recipient, or an employee or agent > responsible for delivering this message to the intended recipient, you are > hereby notified that any dissemination, distribution, copying, or other use > of this message or its attachments is strictly prohibited. If you have > received this message in error, please notify the sender immediately by > replying to this message and please delete it from your computer. Any views > expressed in this message are those of the individual sender unless > otherwise stated. Company has taken enough precautions to prevent the spread > of viruses. However the co > mpany accepts no liability for any damage caused by any virus transmitted by > this email. > ************************************************************************************************************************************************************* > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user
