Hi everybody, I'm using ffmpeg to capture video from a webcam (H264 source) and save it in a container (MP4) without re-encoding.
Often I get wrong frame timestamp in output video, so it starts not from 0(zero) but from the "machine uptime"(something like 16hrs...). What I need is that the output video should start with 0 timestamp, is there some options about that ?. Platform: ARM Linux: 3.16 Webcam: Sonix SN9C292 Driver: UVC Below my command line: ffmpeg -probesize 32 -rtbufsize 10000k -pix_fmt yuv420p -r ${FPS} -s ${W}x${H} -framerate ${FPS} -vcodec h264 -f v4l2 -i /dev/video1 -vcodec copy -r ${FPS} -reset_timestamps 1 -frag_duration 1000000 -movflags empty_moov+omit_tfhd_offset+frag_keyframe+default_base_moof -f MP4 -y ${FILENAME} Below the output of ffprobe (with -show_frame option) As you can see the first frame has pkt_pts_time = 0, the second frame has pkt_pts_time=59676.907910 [FRAME] media_type=video stream_index=0 key_frame=1 pkt_pts=0 pkt_pts_time=0.000000 pkt_dts=0 pkt_dts_time=0.000000 best_effort_timestamp=0 best_effort_timestamp_time=0.000000 pkt_duration=N/A pkt_duration_time=N/A pkt_pos=984 pkt_size=36747 width=1280 height=720 pix_fmt=yuv420p sample_aspect_ratio=N/A pict_type=I coded_picture_number=0 display_picture_number=0 interlaced_frame=0 top_field_first=0 repeat_pict=0 [/FRAME] [FRAME] media_type=video stream_index=0 key_frame=0 pkt_pts=611091537 pkt_pts_time=59676.907910 pkt_dts=611091537 pkt_dts_time=59676.907910 best_effort_timestamp=611091537 best_effort_timestamp_time=59676.907910 pkt_duration=N/A pkt_duration_time=N/A pkt_pos=37919 pkt_size=18482 width=1280 height=720 pix_fmt=yuv420p sample_aspect_ratio=N/A pict_type=P coded_picture_number=1 display_picture_number=0 interlaced_frame=0 top_field_first=0 repeat_pict=0 [/FRAME] [FRAME] ffprobe version N-78067-g9079e99 Copyright (c) 2007-2016 the FFmpeg developers built with gcc 5.2.0 (GCC) configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfi g --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca -- enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libm p3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --ena ble-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-decklink --enable-z lib libavutil 55. 15.100 / 55. 15.100 libavcodec 57. 22.102 / 57. 22.102 libavformat 57. 23.100 / 57. 23.100 libavdevice 57. 0.100 / 57. 0.100 libavfilter 6. 27.100 / 6. 27.100 libswscale 4. 0.100 / 4. 0.100 libswresample 2. 0.101 / 2. 0.101 libpostproc 54. 0.100 / 54. 0.100 [mov,mp4,m4a,3gp,3g2,mj2 @ 00000000005f6100] decoding for stream 0 failed Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1484126232.663.mkv': Metadata: major_brand : iso5 minor_version : 512 compatible_brands: iso6mp41 encoder : Lavf56.40.101 - CBRVBR: 2 Duration: 16:37:03.92, start: 0.000000, bitrate: 2 kb/s Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1280x720, 2 kb/s, 0.02 fps, 10240 tbr, 10240 tbn, 20480 tbc (default) Metadata: handler_name : VideoHandler [h264 @ 0000000000609ca0] AVC: nal size 44498 Last message repeated 1 times [h264 @ 0000000000609ca0] no frame! Thank you _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".