Recherche avancée

Sur d’autres sites (9933)

• ffmpeg connection timeout for rtsp streams

  24 décembre 2022, par Bods1994

  i tried to recoreds rtsp streams using ffmpeg with this command :
ffmpeg -hide_banner -loglevel error -y -rtsp_transport tcp -i rtsp://192.168.0.147:554/live/ch0 -t 600 -acodec copy -vcodec copy -metadata title="CAM1" -timeout 3 -f segment -reset_timestamps 1 -segment_time 60 -segment_atclocktime 1 -segment_format mkv -strftime 1 C:\temp\%Y%m%d_%H%M%S.mkv

  


  If the connection is lost during recording, ffmpeg will exit within severals milliseconds.
But if the camera ist not available when connecting, it will hang forever.

  


  I read severals posts to use "-stimeout Unrecognized option 'stimeout'. Error splitting the argument list : Option not found

  


  For my tests i used the windows version downloaded from the two mirrors listed at https://ffmpeg.org/download.html#build-windows.
Each buils ist from 2022-12-22.

  


  Has someone an idea how to detect conection problems and to a retry after some seconds ?

  


• MP3 file become silent when time changed in Firefox with audio API

  14 décembre 2022, par Simon Trichereau

  I have some problem but I need to give you some context :

  


  I have a production environment with large audio mp3 files. Everything is working perfectly but files are too heavy. I used ffmpeg to reduce their Bitrates from 320kbit/s to 190kbit/s to free space in my disk.

  


  My script worked well and I saved almost 50% of space, but before to put it in production I wanted to test it on pre-production and there is some problem with Firefox...

  


  When I play the audio everything is working good, if I listen to it normally everything is working BUT, when I click on the range to change the time and navigate into the audio, it becomes silent. Nothing happens, I can stop, start again, change the time, nothing works, but the audio is still playing...

  


  I don't have any errors in my console, nothing so the only solution is to reload the page and play again the audio without changing the time.

  


  I tried in chrome and it works like a charm, but in Firefox no. I also tried without any extensions and still the same...

  


  Do you have any idea what is happening ?

  


  Thanks a lot !

  


  --- EDIT 14/12/2022 ---

  


  Ok, I have tried a lot of different solutions and I finally found one, it seems firefox doesn't support VBR (variable bitrate) so I've compressed my file in CBR and it seems to finally work ...

  


• When performing an overlay operation with ffmpeg, the video at the top becomes blurry

  28 mars 2023, par Lance

  I have encountered a strange problem. When using ffmpeg provided in javacpp-presets to perform an overlay operation on two videos, if the video at the bottom is in motion, the video at the top becomes blurry. However, when I use locally compiled ffmpeg to execute the same command, there is no such problem. I have tried presets 5.x and 6.x, and the same problem occurs. Who can help me ?

  


  command :

  


  .javacpp/cache/ffmpeg-5.0-1.5.7-macosx-x86_64.jar/org/bytedeco/ffmpeg/macosx-x86_64/ffmpeg  -y -f lavfi -i color=c=black:s=1920x1080 -i a.mp4 -i b.mp4 -i c.mp4 -filter_complex "[2:v][3:v]alphamerge[alphamerge0];[1:v]scale=1920x1080[out0];[0:v][out0]overlay=enable='between(t,0.0,40.141)':x=0.0:y=0.0[overlay0];[overlay0][alphamerge0]overlay=enable='between(t,0.0,40.141)':x=0.0:y=0.0[out]" -preset medium -t 00:00:40.141 -crf 20 -vcodec h264 -map "[out]" -profile:v high -force_key_frames "expr:gte(t,n_forced*8)" out.mp4

  


  I have tried to change preset,crf,codec,profile and so on, nothing works.

  


  blurry ffmpeg version :

  


  .javacpp/cache/ffmpeg-5.0-1.5.7-macosx-x86_64.jar/org/bytedeco/ffmpeg/macosx-x86_64/ffmpeg -version
ffmpeg version 5.0 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 12.0.0 (clang-1200.0.32.29)
configuration: --prefix=.. --disable-iconv --disable-opencl --disable-sdl2 --disable-bzlib --disable-lzma --disable-linux-perf --disable-xlib --enable-shared --enable-version3 --enable-runtime-cpudetect --enable-zlib --enable-libmp3lame --enable-libspeex --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-openssl --enable-libopenh264 --enable-libvpx --enable-libfreetype --enable-libopus --enable-libxml2 --enable-libsrt --enable-libwebp --enable-pthreads --enable-indev=avfoundation --disable-libxcb --extra-cflags='-I../include/ -I../include/libxml2' --extra-ldflags=-L../lib/ --extra-libs='-lstdc++ -ldl -lz -lm'
libavutil      57. 17.100 / 57. 17.100
libavcodec     59. 18.100 / 59. 18.100
libavformat    59. 16.100 / 59. 16.100
libavdevice    59.  4.100 / 59.  4.100
libavfilter     8. 24.100 /  8. 24.100
libswscale      6.  4.100 /  6.  4.100
libswresample   4.  3.100 /  4.  3.100


  


  normal local version :

  


  ffmpeg -version
ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.0.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --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-neon
libavutil      57. 17.100 / 57. 17.100
libavcodec     59. 18.100 / 59. 18.100
libavformat    59. 16.100 / 59. 16.100
libavdevice    59.  4.100 / 59.  4.100
libavfilter     8. 24.100 /  8. 24.100
libswscale      6.  4.100 /  6.  4.100
libswresample   4.  3.100 /  4.  3.100
libpostproc    56.  3.100 / 56.  3.100