January 2024 - ffmpeg-user - lists.ffmpeg.org

Stream copy of mxf format is weird
by Syehoon Kim 31 Jan '24

31 Jan '24

Dear all, Sorry for sending an HTML-only message right before. I am trying to make a stream copy of a mxf file to a new one with custom metadata. But, I found that the new stream copied mxf file suffers from non-monotonous dts problem. What I found is that dts is duplicated every 3 frames. I tried to use setpts bsf:v, but it didn't work. You can find in the attached stream_copied_mxf.txt, the message below appears: "Application provided invalid, non monotonically increasing dts to muxer in stream 0" ffprobe result shows the same dts information: it goes like 1,2,2,4,5,5,7,8,8,.... The command I used is as follows: ffmpeg -i (original_mxf).mxf -codec copy (stream_copied).mxf Interestingly, if I convert the weird mxf output file to another format such as mov, or avi, it works well. Of course, I used the latest ffmpeg. Should I report this as a bug? If you have any idea, I would appreciate it. Thank you. Sincerely, Kim Syehoon

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Stream copy of mxf format is weird
by 김세훈 30 Jan '24

30 Jan '24

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ffmpeg destroying the video stream when copying from m2ts to m2ts
by Binarus 23 Jan '24

23 Jan '24

Dear all, I have a m2ts file that contains one video track and 14 other audio and subtitle tracks. I'd like to copy the video track into a new m2ts file. This basically works, but ffmpeg is doing something bad to the video track while copying. The new file plays in VLC and MPC-HC, but the video track is massively disturbed. For some seconds, it plays normally, for the next seconds, it shows just random color mess, then it plays normally again, and so on. When converting to mkv instead, the new file plays correctly. This is the ffmpeg version: ffmpeg version 2024-01-14-git-34a47b97de-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers built with gcc 12.2.0 (Rev10, Built by MSYS2 project) This is the command line to extract the video stream from the m2ts file into a new m2ts file: ffmpeg -i in.m2ts -map 0:0 -codec copy out.m2ts I also have successively added -copyts, -muxpreload 0, -muxdelay 0, -probesize 100G and -analyzeduration 100G to that command line at the correct places, and also have tried combinations thereof, but it didn't change anything. These are the streams in the input file: Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 23.98 fps, 23.98 tbr, 90k tbn Stream #0:1[0x1100]: Audio: dts (DTS-HD MA) ([134][0][0][0] / 0x0086), 48000 Hz, 5.1(side), s16p Stream #0:2[0x1101]: Audio: dts (DTS-HD MA) ([134][0][0][0] / 0x0086), 48000 Hz, 5.1(side), s16p Stream #0:3[0x1102]: Audio: dts (DTS-HD MA) ([134][0][0][0] / 0x0086), 48000 Hz, 5.1(side), s16p Stream #0:4[0x1103]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo, fltp, 192 kb/s Stream #0:5[0x1104]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, 5.1(side), fltp, 640 kb/s Stream #0:6[0x1200]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:7[0x1201]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:8[0x1202]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:9[0x1203]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:10[0x1204]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:11[0x1205]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:12[0x1206]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:13[0x1207]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090) Stream #0:14[0x1208]: Subtitle: hdmv_pgs_subtitle ([144][0][0][0] / 0x0090), 1920x1080 I'd be happy to provide the file for further analysis. However, I can't make the file public. The file is about 300 MB; I can upload it somewhere and provide the link. If somebody is interested, I'd like to discuss the further procedure via personal email; please feel free to drop me a note. Best regards, and thank you very much, Binarus P.S. I don't know yet whether the problem is specific only to the input file in question.

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Re: [FFmpeg-user] MV-HEVC Support
by Dean Zwikel 22 Jan '24

22 Jan '24

Are there any plans to support MV-HEVC? If not, is there some way to request/suggest it?

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FFmpeg's HLS muxer's deprecation of the hls_wrap option
by Dennis Mungai 22 Jan '24

22 Jan '24

Hello, Is there a valid technical reason as to why FFmpeg's HLS muxer dropped the hls_wrap option? There are many cases where the hls_wrap option remains critical so as to preserve the set of output file names without increments. This deprecation breaks that. For now, this behavior can be worked around by switching to the segment muxer and then setting the -segment_wrap option therein, but its' not an ideal solution. Kindly review this deprecation, with an appeal to revert the patchwork that removed the hls_wrap option. Warm regards, Dennis.

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patch for 44.1/32 khz pcm input in pcm dvd encoder
by Andrew Randrianasulu 22 Jan '24

22 Jan '24

relative to ffmpeg.git commit 6c4388b468bf92c0c1e7733c6cfe4ff3f9ca9723 lightly tested with mpv and mediainfo like this: ./ffmpeg -i ~/f9518976.mp4 -target pal-dvd -ar 44100 -c:a pcm_dvd -f dvd t.mpg mpv plays sound correctly, mediainfo does not know those frequencies and display 0khz. ;)

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MV-HEVC Support
by Dean Zwikel 21 Jan '24

21 Jan '24

Apple supports recording of Spatial Video (Stereo/3D) using the iPhone 15 Pro and Max. The videos are recoded using MV-HEVC format. Does FFmpeg support decoding these videos and converting them using the Stereo3D filter? I can't see to find any FFmpeg documentation on it. Thank you

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LPCM in DVD - 44.1/32khz sample rate?
by Andrew Randrianasulu 21 Jan '24

21 Jan '24

According to this source (vlc) lpcm dvd audio supports lower frequencies like 44100/32000 hz - useful for direct dv transcoding for example .... https://github.com/videolan/vlc/blob/master/modules/codec/lpcm.c see lines 524, 608 Does this mean that libavcodec/pcm-dvdenc.c can be trivially extended to support those ? Same question for mplex. (it only supports 48/96 khz lpcm audio). I also found this table via mjpeg-users archives: https://dvd.sourceforge.net/dvdinfo/lpcm.html it lists dynamic range/gain (?) setting equations. Not mplex nor ffmpeg support setting this to anything but hardcoded 0x80 This might be source of my "too loud" lpcm dvd experiments because I was making lpcm file via cinelerra-gg's raw pcm output format (using libsndfile internally).

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Hello. Can you help me answer questions about converting vr 360 videos to cubic 2x3 format
by Anh The 21 Jan '24

21 Jan '24

I need to convert vr 360 video to cubic 2x3 format. Usually I use command v360=equirect:c3x2 . But basically it just converts to a cubic square shape with a length, width, and height ratio of 1:1:1. I want to change it so that it can produce 3x2 frames that when merged will create a rectangular box with a different ratio from the original ratio input. For example, length:width:height is 2:1:0.7, for example. I looked for documentation but it seems like few users have done anything about this. I hope you can help me. Thanks a lot

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OT: a term for trying to avoid making mistakes due to unfamiliarity with a subject
by Rob Hallam 18 Jan '24

18 Jan '24

(off topic but asking here as someone might remember the term) In the last year or two there was - I think - a user on this ML who prefixed or suffixed their query with wording to the effect of, "I am new to this so I don't know what I don't know, so please help me avoid leaving out needed info" They used a shorthand term that I think was an eponym for this- can anyone remind me what it was? It is closely related to but is not: - Dunning-Kruger effect (https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect) - the Rumsfeld "unknown unknowns" (https://en.wikipedia.org/wiki/There_are_unknown_unknowns) - "unconscious incompetence" (https://en.wikipedia.org/wiki/Four_stages_of_competence) I include those wikipedia links as their "See Also" section is where I thought I might find this but no dice yet. Cheers, Rob

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