I have a video that is supposedly not VFR (ffmpeg vfrdet command and output pasted at the very bottom), but the number of extracted frames, or frame count with ffprobe, doesn't match what would be expected based on frame rate and duration by a large margin (off by a factor of nearly 3x). Please note that this video comes from an older camera, and could well be corrupted.
If I try to force a frame rate with the following, I still have an incorrect number of frames. Any ideas on how I can force the video to 29.97 and actually extract the number of frames that would be correct for a CFR video of that duration and fps? ./ffmpeg -i 0578ad6d7c6e.original.mp4 -r 30000/1001 -vsync 2 -qscale 1 0578ad6d7c6e_img/%d.jpg ffmpeg version N-103117-g1f58503013-tessus https://evermeet.cx/ffmpeg/ Copyright (c) 2000-2021 the FFmpeg developers built with Apple clang version 11.0.0 (clang-1100.0.33.17) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay libavutil 57. 3.100 / 57. 3.100 libavcodec 59. 3.102 / 59. 3.102 libavformat 59. 4.101 / 59. 4.101 libavdevice 59. 0.100 / 59. 0.100 libavfilter 8. 1.103 / 8. 1.103 libswscale 6. 0.100 / 6. 0.100 libswresample 4. 0.100 / 4. 0.100 libpostproc 56. 0.100 / 56. 0.100 Input #0, mpeg, from '0578ad6d7c6e.original.mp4': Duration: 00:26:10.77, start: 0.218556, bitrate: 789 kb/s Stream #0:0[0x1bf]: Data: dvd_nav_packet Stream #0:1[0x1e0]: Video: mpeg2video (Main), yuv420p(tv, smpte170m, top first), 480x480 [SAR 4:3 DAR 4:3], Closed Captions, 29.97 fps, 29.97 tbr, 90k tbn Side data: cpb: bitrate max/min/avg: 2252800/0/0 buffer size: 1835008 vbv_delay: N/A Stream #0:2[0x1c0]: Audio: mp2, 48000 Hz, stereo, s16p, 192 kb/s Please use -q:a or -q:v, -qscale is ambiguous Stream mapping: Stream #0:1 -> #0:0 (mpeg2video (native) -> mjpeg (native)) Press [q] to stop, [?] for help [swscaler @ 0x7fcc30008000] deprecated pixel format used, make sure you did set range correctly Output #0, image2, to '0578ad6d7c6e_img/%d.jpg': Metadata: encoder : Lavf59.4.101 Stream #0:0: Video: mjpeg, yuvj420p(pc, smpte170m, top first), 480x480 [SAR 4:3 DAR 4:3], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn Metadata: encoder : Lavc59.3.102 mjpeg Side data: cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A [mpeg2video @ 0x7fcc6f417200] ac-tex damaged at 25 26bitrate=N/A speed= 43x [mpeg2video @ 0x7fcc6f417200] Warning MVs not available [mpeg2video @ 0x7fcc6f417200] concealing 120 DC, 120 AC, 120 MV errors in I frame 0578ad6d7c6e.original.mp4: corrupt decoded frame in stream 1 frame=14671 fps=1294 q=1.0 Lsize=N/A time=00:08:09.52 bitrate=N/A speed=43.2x video:235031kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown > ./ffmpeg -i 0578ad6d7c6e.mp4 -vf vfrdet -an -f null - ffmpeg version N-103117-g1f58503013-tessus https://evermeet.cx/ffmpeg/ Copyright (c) 2000-2021 the FFmpeg developers built with Apple clang version 11.0.0 (clang-1100.0.33.17) configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvmaf --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay libavutil 57. 3.100 / 57. 3.100 libavcodec 59. 3.102 / 59. 3.102 libavformat 59. 4.101 / 59. 4.101 libavdevice 59. 0.100 / 59. 0.100 libavfilter 8. 1.103 / 8. 1.103 libswscale 6. 0.100 / 6. 0.100 libswresample 4. 0.100 / 4. 0.100 libpostproc 56. 0.100 / 56. 0.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '0578ad6d7c6e.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.45.100 Duration: 00:08:09.52, start: 0.000000, bitrate: 685 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 852x480 [SAR 1:1 DAR 71:40], Closed Captions, 602 kb/s, 29.97 fps, 29.97 tbr, 30k tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 73 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf59.4.101 Stream #0:0(und): Video: wrapped_avframe, yuv420p(progressive), 852x480 [SAR 1:1 DAR 71:40], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] encoder : Lavc59.3.102 wrapped_avframe frame=14671 fps=8595 q=-0.0 Lsize=N/A time=00:08:09.52 bitrate=N/A speed= 287x video:6304kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown [Parsed_vfrdet_0 @ 0x7f9c6cf064c0] VFR:0.000000 (0/14670) _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
