January 2025 - ffmpeg-user - lists.ffmpeg.org

Live lipsync from different inputs and RTCSTART in (a)setpts
by Vilnis Bicevskis 14 Jan '25

14 Jan '25

Hello! I am trying to deal with syncing audio and video from different sources for live streaming. Need to mention that video source PTS cannot be fully trusted there, some duplicates or drops should be made to maintain PTS in sync with wall clock. One way to synchronise the sources is by ensuring the input PTS are aligned for audio and video. Input PTS can be updated by setpts/asetpts filters. And wallclock could be the common clock source to rely on as inputs cannot reference one another. But there is a problem, that RTCSTART field (that is "The wallclock (RTC) time at the start of the movie in microseconds.") doesn't contain the exact wallclock when the PTS of the input is started (initiated). It contains the time when the setpts/asetpts filter is initiated. It differs from the timestamp from which PTS is offseted and so it cannot be used as a trusted timing reference source. At least for precision required to ensure lip-sync. And I didn't find any other parameter that could give system time from which components PTS time is offseted to rely on. One way to pass desired wallclock value to RTCSTART parameter is to create a patch that: 1) adds extra field containing wallclock of the input start to InputFile, AVFrame, AVPacket, 2) sets RTCSTART from the AVFrame upon first frame passing through the setpts/asetpts filter, like it is done for STARTPTS and STARTT variables. Tested and that works fine at least for my use case. Kinda don't really like the "dragging" of extra field in AVFrame and AVPacket that are needed only for initialisation. Some thoghts on other (maybe better) ways how the lip-sync could be achieved? Or wallclock time value passed from input to setpts filter? Best regards, Vilnis

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using the silencedetect
by Jaime Alvarado 14 Jan '25

14 Jan '25

I am Jaime Alvarado, I am working with the ffmpeg-js in a web app. I know that the are different proyects but I want use the silencedetect filter in my web app. using the ffmpeg-js I obtain the next error: Automatic encoder selection failed for output stream #0:0. Default encoder for format null (codec pcm_s16le) is probably disabled. Please choose an encoder manually. Error selecting an encoder for stream 0:0 I understant that the ffmpeg-js solution lacks some functions compare with the official ffmpeg executable. Comparing both compilations, are different: ffmpeg version n4.2.2 Copyright (c) 2000-2019 the FFmpeg developers built with emcc (Emscripten gcc/clang-like replacement) 1.39.11 configuration: --cc=emcc --ranlib=emranlib --enable-cross-compile --target-os=none --arch=x86 --disable-runtime-cpudetect --disable-asm --disable-fast-unaligned --disable-pthreads --disable-w32threads --disable-os2threads --disable-debug --disable-stripping --disable-safe-bitstream-reader --disable-all --enable-ffmpeg --enable-avcodec --enable-avformat --enable-avfilter --enable-swresample --enable-swscale --disable-network --disable-d3d11va --disable-dxva2 --disable-vaapi --disable-vdpau --enable-decoder=vp8 --enable-decoder=h264 --enable-decoder=vorbis --enable-decoder=opus --enable-decoder=mp3 --enable-decoder=aac --enable-decoder=pcm_s16le --enable-decoder=mjpeg --enable-decoder=png --enable-demuxer=matroska --enable-demuxer=ogg --enable-demuxer=mov --enable-demuxer=mp3 --enable-demuxer=wav --enable-demuxer=image2 --enable-demuxer=concat --enable-protocol=file --enable-filter=aresample --enable-filter=scale --enable-filter=crop --enable-filter=overlay --enable-filter=hstack --enable-filter=vstack --disable-bzlib --disable-iconv --disable-libxcb --disable-lzma --disable-sdl2 --disable-securetransport --disable-xlib --enable-zlib --enable-encoder=libx264 --enable-encoder=libmp3lame --enable-encoder=aac --enable-muxer=mp4 --enable-muxer=mp3 --enable-muxer=null --enable-gpl --enable-libmp3lame --enable-libx264 --extra-cflags='-s USE_ZLIB=1 -I../lame/dist/include' --extra-ldflags=-L../lame/dist/lib libavutil 56. 31.100 / 56. 31.100 libavcodec 58. 54.100 / 58. 54.100 libavformat 58. 29.100 / 58. 29.100 libavfilter 7. 57.100 / 7. 57.100 ibswscale 5. 5.100 / 5. 5.100 libswresample 3. 5.100 / 3. 5.100 ffmpeg version 6.1.1-3ubuntu5 Copyright (c) 2000-2023 the FFmpeg developers built with gcc 13 (Ubuntu 13.2.0-23ubuntu3) configuration: --prefix=/usr --extra-version=3ubuntu5 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-omx --enable-gnutls --enable-li baom --enable-libass --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable- libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheo ra --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable- libvpl --disable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-li bsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 58. 29.100 / 58. 29.100 libavcodec 60. 31.102 / 60. 31.102 libavformat 60. 16.100 / 60. 16.100 libavdevice 60. 3.100 / 60. 3.100 libavfilter 9. 12.100 / 9. 12.100 libswscale 7. 5.100 / 7. 5.100 libswresample 4. 12.100 / 4. 12.100 libpostproc 57. 3.100 / 57. 3.100 La pregunta o solicitud es cómo compilar o qué indicadores necesito para que el filtro silencedetect funcione en la web.

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hevc_nvenc pts < dts error on some time_bases
by Louis Letourneau 14 Jan '25

14 Jan '25

Using ffmpeg version 7.0.2 Copyright (c) 2000-2024 the FFmpeg developers I keep getting this error: [mp4 @ 0x60f656ba95c0] pts (1000) < dts (1997) in stream 0 If in my C++ code I try to encode images in timebase 1/60000, framerate 60000/1001 or 60000/1000 I modified the doc/examples/mux.c to force hevc_nvenc and timebases (patch attached) If I use 1/60 timbase and 60/1 frame_rate, it all works fine. ffmpeg command line seems to be able to do it at 59.94 with -vf fps or forcing with -r Using libx264 or libx265 works fine. Any ideas? Thanks Louis

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ffmpeg doesn't reconnect when capturing live connections
by arthurpeabody 13 Jan '25

13 Jan '25

I capture live streams. When a stream drops ffmpeg stops capturing, doesn't reconnect, and keeps running after the time limit. For example: ffmpeg -i https://playerservices.streamtheworld.com/api/livestream-redirect/KUNMFM_32… -t 180 -reconnect true -reconnect_streamed true -reconnect_on_network_error true -timelimit 180 -loglevel warning kunm_StarDate-20250111-1800.mp3 I used to use streamripper, which keeps on trying to reconnect for the time specified and quits when the time expires, but works only for icecast and shoutcast streams.

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[ffmpeg-user] what do Ignoring outlier non primary stream endtime 1813.839966 means ?
by cavelier 12 Jan '25

12 Jan '25

Hi; i don't find any exponations in documentation about this messages of outlier streams... The consequences are that the film runs normally but about a few minutes picture becomes black , the film carries only with sound and black image. Perhaps the encoding stops after a few minutes. Is the f concat or me=umh option the origin ? ffmpeg: ffmpeg version 6.0.1 Copyright (c) 2000-2023 the FFmpeg developers built with gcc 4.9.2 (GCC) [mov,mp4,m4a,3gp,3g2,mj2 @ 0x16e4740] Errors messages in green in Konsole: Ignoring outlier non primary stream endtime 1813.839966 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x16e4740]Ignoring outlier non primary stream duration 1806.785034 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x16e4740] Ignoring outlier non primarystream endtime 1813.839966 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x16e4740]Ignoring outlier non primary stream duration 1806.785034 [mov,mp4,m4a,3gp,3g2,mj2 @ 0x16e4740] Auto-inserting h264_mp4toannexb bitstream filter [h264 @ 0x16e8d00] Reinit context to 1920x1088,pix_fmt: yuv420p Complete commande 's strings : ffmpeg -hide_banner -y -loglevel verbose -fix_sub_duration -f concat -safe 0 -i ffconcat.txt -map 0:v:0 -max_interleave_delta 0 -muxpreload 0 -muxdelay 0 -c:v libx264 -profile:v main -level 4.0 -tune film -preset medium -x264-params "tff=1:force-cfr=1:fps=25/1:b_adapt=1:crf=23:ref=4:me=umh" -vf unsharp=luma_msize_x=7:luma_msize_y=7:luma_amount=1.2,fps=25/1,eq=contrast=1::gamma=1:saturation=1:gamma_weight=0.2:brightness=0,hqdn3d=2:1:2:2,fade=t=out:st=2472.76:d=2" -fps_mode cfr -map 0:a -c:a libfdk_aac -b:a 192k -af "aresample=async=1:min_hard_comp=0.100000:first_pts=0,afade=t=out:st=2472.76:d=2" -map "0:s?" -c:s copy -metadata:s:a:0 "language=fre" -metadata:s:a:1 "language=qaa" -metadata:s:a:2 "language=fra" -metadata:s:a:2 "title=visual impaired" -metadata:s:s:0 "language=fre" -metadata:s:s:0 "title=hearing impaired" -metadata:s:s:1 "language=fre" -f mp4 output.mp4. $ cat ffconcat.txt file ./temp0.mp4 file ./temp2.mp4 file ./temp4.mp4 -- cordialement jean-jacques. Ce message a été écrit sur un système libre mageia "Tant que l'homme sera mortel, il ne pourra pas être totalement décontracté..." Woody Allen.

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Non deterministic artifacts in h264 full HD live streams
by dude bro 12 Jan '25

12 Jan '25

Hello, I have been experiencing artifacts when playing nvenc h264 encoded videos. I am using ffmpeg’s nvenc integration to encode the video, and I play the encoded video with ffplay. Every time I see an artifact I also get two ffmpeg error logs: 1. left block unavailable for requested intra/intra4x4 mode (-1) 2. error while decoding MB * *, bytestream * I used the trace log level and saw that the artifacts occur when receiving an IDR NAL unit. The ffplay version I am using is 4.2.4. I would be grateful to receive possible solutions for this issue, and would be glad to answer any follow up questions that might come up. Thank you in advance!

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Fwd: FFMPEG SLOW (new versions)
by Carl Zwanzig 09 Jan '25

09 Jan '25

(reply to the list, not to the person unless requested) -------- Forwarded Message -------- Subject: Re: [FFmpeg-user] FFMPEG SLOW (new versions) Date: Thu, 9 Jan 2025 20:53:27 +0100 From: Giovanni Fast1 <gdvalle(a)fastwebnet.it> To: Carl Zwanzig <cpz(a)tuunq.com> Dear mr. Carl, the ffmpeg exe that is fast is the following ffmpeg version 4.4.1-full_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers built with gcc 11.2.0 (Rev1, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libdav1d --enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libglslang --enable-vulkan --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libilbc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint libavutil 56. 70.100 / 56. 70.100 libavcodec 58.134.100 / 58.134.100 libavformat 58. 76.100 / 58. 76.100 libavdevice 58. 13.100 / 58. 13.100 libavfilter 7.110.100 / 7.110.100 libswscale 5. 9.100 / 5. 9.100 libswresample 3. 9.100 / 3. 9.100 libpostproc 55. 9.100 / 55. 9.100 The one that is slow is the following ffmpeg version 2024-12-27-git-5f38c82536-full_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers built with gcc 14.2.0 (Rev1, Built by MSYS2 project) configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-lcms2 --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma --enable-libsnappy --enable-zlib --enable-librist --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray --enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption --enable-libdav1d --enable-libdavs2 --enable-libopenjpeg --enable-libquirc --enable-libuavs3d --enable-libxevd --enable-libzvbi --enable-libqrencode --enable-librav1e --enable-libsvtav1 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve --enable-libxvid --enable-libaom --enable-libjxl --enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r --enable-libfreetype --enable-libfribidi --enable-libharfbuzz --enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2 --enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl --enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc --enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio --enable-libgme --enable-libmodplug --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libshine --enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc --enable-libcodec2 --enable-libilbc --enable-libgsm --enable-liblc3 --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite --enable-libmysofa --enable-librubberband --enable-libsoxr --enable-chromaprint libavutil 59. 53.100 / 59. 53.100 libavcodec 61. 28.100 / 61. 28.100 libavformat 61. 9.102 / 61. 9.102 libavdevice 61. 4.100 / 61. 4.100 libavfilter 10. 6.101 / 10. 6.101 libswscale 8. 13.100 / 8. 13.100 libswresample 5. 4.100 / 5. 4.100 libpostproc 58. 4.100 / 58. 4.100 Please consider that I tested many ffmpeg version released in 2023 and 2024 and they all were slow. Regards Giovanni Il 09/01/2025 20:36, Carl Zwanzig ha scritto: > On 1/9/2025 11:22 AM, Giovanni Fast1 wrote: >> The ffmpeg.exe I use is an executable of 108.45 GB, filedate 25 Oct >> 2021, ant it does the job at 65-70 frames per second, pretty fast. >> >> But if I replace the ffmpeg.exe file with a more recent one, >> including the one released a few days ago (137.53 MB, filedate 30 Dec >> 2024), the speed goes down to 25-30 fps. > > Please always include the command output so we can see which > version/build/etc you're running- it'll start with something like this: > > ffmpeg version 6.1.1-full_build-www.gyan.dev Copyright (c) 2000-2023 > the FFmpeg developers > built with gcc 12.2.0 (Rev10, Built by MSYS2 project) > [...] > (that's quite old) > > z! >

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FFMPEG SLOW (new versions)
by Giovanni Fast1 09 Jan '25

09 Jan '25

Dear sirs at FFMPEG, I need some help and I hope this email is the right way. I am just a light user of ffmpeg.exe. My PC is based on a Intel Core I5, with 8 GB ram, SSD, Windows 11; I mainly use FFMPEG to adjust the audio level of my movies, that generally are mp4 files. I use simple commands (BAT files) to launch the adjustment; as an example: ffmpeg -i input.mp4 -vcodec copy -af "volume=-6dB" output.mp4 The ffmpeg.exe I use is an executable of 108.45 GB, filedate 25 Oct 2021, ant it does the job at 65-70 frames per second, pretty fast. But if I replace the ffmpeg.exe file with a more recent one, including the one released a few days ago (137.53 MB, filedate 30 Dec 2024), the speed goes down to 25-30 fps. Is there a way to have the newer version working as fast as the old one ? Thanks for your attention. Have my best regards and wishes for the new year. Giovanni Della Valle (IBM retired), Rome, Italy.

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How to display web pages to a videowall
by Gennaro Esposito 09 Jan '25

09 Jan '25

Greetings My company has a video wall whose decoder is essentially designed only for cameras, so the only devices it can view, via IP, are those with "protocols" like RTSP or Onvif. It also has 4 HMDI/DVI ports to view any "normal" graphic output (btw: it's a Dahua NVD0905DH-4I-4K, but the documentation about it is really sparse). Now, the problem that I wanted to put to you and which is reported in the subject of this email, is the following: some web pages must also be displayed on the video wall. Our facilities, in fact, are monitored via BMS and DCIM systems which expose the data as web pages. The question is: is there a way in which ffmpeg can access these pages and "convert" them into a "stream" to feed to the decoder? Thanks in advance for your answers G. Esposito

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Re: [FFmpeg-user] Is there a way to reconnect to a RTSP stream after it disappears from the network?
by Mikhail Morfikov 07 Jan '25

07 Jan '25

On 2025-01-06 23:47, Carl Zwanzig wrote: > > Also for curiosity- which camera is this? > It's Tapo C520WS.

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