>De : ffmpeg-user <ffmpeg-user-boun...@ffmpeg.org> De la part de Wodzu >Objet : [FFmpeg-user] h264_mp4toannexb does not store a proper frame-rate. > >Hi, I have an mp4 file, that I want to convert to Annex B. The file >properties are: Duration: 01:59:59.97, start: 0.000000, bitrate: 1221 kb/s > Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuvj420p(pc, >>bt470bg/bt470bg/smpte170m), 1280x720, 1221 kb/s > >15 fps, 15 tbr, 15360 tbn, 60 tbc (default) > > I am converting to Annex B this way: ffmpeg -i file.mp4 -vcodec copy > -vbsf h264_mp4toannexb -an output_file.264 After running >ffprobe on the > output_file.264: Duration: N/A, bitrate: N/A Stream #0:0: Video: > h264 (Main), yuvj420p(pc, bt470bg/bt470bg/smpte170m, progressive), 1280x720, > 30 fps, 30 tbr, 1200k tbn, 60 tbc
>As you can see, the duration information has been lost This is expected for an elementary stream; a muxer is required to gain instant access to such a value. Otherwise, the full elementary stream has to be parsed from end to end which means some delay and performance issues. >and fps is now 30 fps. It it possible to retain the original FPS? Cheers, >Bruce Probing an elementary stream is usually the best way, the most reliable to get such a value. I think it is correct here. I think your MP4 input looks suspicious with "15 fps / 60 tbc". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
