#11339: ffmpeg misdetecting framerate of dv --------------------------------------+---------------------------------- Reporter: dave rice | Type: defect Status: new | Priority: normal Component: undetermined | Version: 7.1 Keywords: dv | Blocked By: Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | --------------------------------------+---------------------------------- Summary of the bug: How to reproduce: make a sample dv. Here I note that the output is 29.97 fps. {{{ $ ffmpeg -y -f lavfi -i testsrc2=r=30000/1001:s=720x480 -f lavfi -i sine -pix_fmt yuv411p -c:v dvvideo -t 2 -ac 2 -ar 48000 test.dv ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers built with Apple clang version 14.0.0 (clang-1400.0.29.202) configuration: --prefix=/usr/local/Cellar/ffmpeg/7.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host- ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable- libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable- librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore- amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.100 / 61. 19.100 libavformat 61. 7.100 / 61. 7.100 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 4.100 / 10. 4.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 Input #0, lavfi, from 'testsrc2=r=30000/1001:s=720x480': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: wrapped_avframe, yuv420p, 720x480 [SAR 1:1 DAR 3:2], 29.97 fps, 29.97 tbr, 29.97 tbn Input #1, lavfi, from 'sine': Duration: N/A, start: 0.000000, bitrate: 705 kb/s Stream #1:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s Stream mapping: Stream #0:0 -> #0:0 (wrapped_avframe (native) -> dvvideo (native)) Stream #1:0 -> #0:1 (pcm_s16le (native) -> pcm_s16le (native)) Press [q] to stop, [?] for help [dvvideo @ 0x7fd195f17840] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd195f181c0] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd195f18b00] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd195f19480] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd195f19dc0] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd195f1a740] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd195f1b080] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd196a07d80] Only top-left chroma location is supported in DV, input value is: unspecified [dvvideo @ 0x7fd195f0a440] Only top-left chroma location is supported in DV, input value is: unspecified Output #0, dv, to 'test.dv': Metadata: encoder : Lavf61.7.100 Stream #0:0: Video: dvvideo, yuv411p(tv, progressive), 720x480 [SAR 1:1 DAR 3:2], q=2-31, 200 kb/s, 29.97 fps, 29.97 tbn Metadata: encoder : Lavc61.19.100 dvvideo Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s Metadata: encoder : Lavc61.19.100 pcm_s16le [out#0/dv @ 0x7fd195f090c0] video:7031KiB audio:375KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown frame= 60 fps=0.0 q=-0.0 Lsize= 6914KiB time=00:00:02.00 bitrate=28320.0kbits/s speed=45.3x }}} When I read the output back into ffmpeg, the frame rate is now 60K! {{{ $ ffmpeg -i test.dv ffmpeg version 7.1 Copyright (c) 2000-2024 the FFmpeg developers built with Apple clang version 14.0.0 (clang-1400.0.29.202) configuration: --prefix=/usr/local/Cellar/ffmpeg/7.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host- ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable- libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable- librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore- amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.100 / 61. 19.100 libavformat 61. 7.100 / 61. 7.100 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 4.100 / 10. 4.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 [dv @ 0x7f9d7f804540] Estimating duration from bitrate, this may be inaccurate Input #0, dv, from 'test.dv': Metadata: timecode : 00:00:00:00 Duration: 00:00:01.97, start: 0.000000, bitrate: 28771 kb/s Stream #0:0: Video: dvvideo, yuv411p, 720x480 [SAR 8:9 DAR 4:3], 28771 kb/s, 60k fps, 29.97 tbr, 60k tbn Stream #0:1: Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s At least one output file must be specified }}} The framerate thus causes fails when rewrapping the dv, such as `ffmpeg -i test.dv -map 0 -c copy test.mov` gives a `fps 60000 is too large` error. Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker. -- Ticket URL: <https://trac.ffmpeg.org/ticket/11339> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker