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• avcodec/libvpxenc : Update the "cpu-used" options default to match the "speed" alias

  6 juin 2014, par Rafaël Carré

  avcodec/libvpxenc : Update the "cpu-used" options default to match the "speed" alias
  Reviewed-by : James Zern <jzern@google.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/libvpxenc.c

• How do I use the ffmpeg CLI to stretch the beginning of an audio stream, using silence, to match the start of the video ?

  26 mai 2019, par enzi

  I’m encoding mpd for DashJS using ffmpeg. I’m trying to encode a video that has audio starting 26 seconds after video. When I play it use DashJS, the video refuses to show until the audio starts. What’s the best way to stretch the audio to to the beginning of the video using the ffmpeg cli using silence ?

  I’ve tried several filters but with no success.

  Here’s my command :

  "ffmpeg" "-i" "static/uploads/tmp.10370ba20dc842f7af87037c8e25e895.mkv" "-c:v" "libx264" "-x264opts" "keyint=25:min-keyint=25:no-scenecut" "-pix_fmt" "yuv420p" "-profile:v" "baseline" "-level" "3" "-coder" "1" "-g" "250" "-c:a" "libfdk_aac" "-b:a" "192k" "-ar" "44100" "-ac" "2" "-map" "0:0" "-map" "0:1" "-map" "0:2" "-map" "0:3" "-metadata" "title=Video" "-f" "dash" "-use_template" "1" "-use_timeline" "1" "-seg_duration" "5" "-init_seg_name" "$RepresentationID$-init.m4s" "-media_seg_name" "$RepresentationID$-$Time$.m4s" "-max_muxing_queue_size" "9999" "-shortest" "-avoid_negative_ts" "make_non_negative" "static/uploads/abea93fe8fe645f291beb6223398e025/index.out"

  I tried amixing evalsrc=0 with source 0:1, the stream that starts at 26 seconds but it still starts at 26 seconds.

• ffmpeg save video in segments, time does not match

  22 août 2022, par Yohann

  I use ffmpeg to save the rtsp live stream to the local, specify the fragment size of 2 seconds and use the current time to name the video file

  


  But the length of the returned video is not equal to 2 seconds and the interval between file names is not 2 seconds

  


  I have tried several command line arguments

  


  ffmpeg -i rtsp://192.168.18.119/live/test -f segment -strftime 1 -segment_time 2 -segment_atclocktime 1 -reset_timestamps 1 -an -vcodec copy ./%Y-%m-%d-%H.%M.%S.mp4

# execute result
2022-08-22-17.20.16.mp4  duration：00:03
2022-08-22-17.20.17.mp4  duration：00:03
2022-08-22-17.20.18.mp4  duration：00:07
2022-08-22-17.20.19.mp4  duration：00:03
2022-08-22-17.20.20.mp4  duration：00:03
# file names are not time aligned


  


  ffmpeg -i rtsp://192.168.18.119/live/test -f segment -strftime 1 -segment_time 2 -reset_timestamps 1 -an -vcodec copy ./%Y-%m-%d-%H.%M.%S.mp4

# execute result
2022-08-22-17.42.36.mp4 duration：00:03
2022-08-22-17.42.37.mp4 duration：00:03
2022-08-22-17.42.41.mD4 duration：00:03
2022-08-22-17.42.44.mp4 duration：00:03
2022-08-22-17.42.48.mp4 duration：00:03
2022-08-22-17.42.51.mp4 duration：00:03
# file names are not time aligned


  


  Expect to generate video

  


  2022-08-22-17.50.00.mp4 时长：00:02
2022-08-22-17.50.02.mp4 时长：00:02
2022-08-22-17.50.04.mD4 时长：00:02
2022-08-22-17.50.06.mp4 时长：00:02
2022-08-22-17.50.08.mp4 时长：00:02
2022-08-22-17.50.10.mp4 时长：00:02
...