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• Fixing audio/video out of sync when editing recorded broadcast

  27 décembre 2019, par sba

  I have recorded broadcast-ed material using a DVB-T tuner.

  That produces several TS files per recording (most likely to keep filesize within FAT32 limitations).

  I have concatenated each recording into a single TS file using :

  ffmpeg.exe -f concat -i $filelist -c copy -y $outputfile

  From there, I need to perform edits to remove commercials, strip extra stuff from the start and end, and optionally extract each episode into a separate file.

  I own Pinnacle Studio 23 Ultimate, that doesn’t support TS as input so I’m converting TS to MP4 using something like :

  ffmpeg -y -i foo.ts -crf 18 -ac 2 -r 25 -c:v libx265 -ar 48000 -b:a 192k -c:a aac -aspect 16:9 bar.mp4

  (I’ve tried several ways/options, including using HandBrake for that conversion).

  What happens is that in the resulting edited material, audio and video are out of sync. Can be in the whole file, or only in some sections.

  This could be linked to glitches (missing frames...) in the original recording.

  But when I play the original single-file TS, or the MP4 version, in any player such as VLC, audio and video are properly aligned. So these players are able to deal with the aforementioned glitches and "re-align" the audio and video streams.

  How can I "rewrite" the whole input file in such a way that audio and video are "fully synchronized" so that editing will be possible ?

  Thanks in advance for your help.

• How to bookmark a video, to skip the video to a cetain duration ?

  17 août 2016, par Prasanth Kumar Arisetti

  I am encoding the incoming camera data, using x264 encoder and mpegtsmux to a filesink .ts files.

  I am pushing the buffers to the pipeline, using, g_signal_emi_by_name.

  Pipeline is something like this :

  gst-launch-1.0 v4l2src ! videoconvert ! video/x-raw,width=720,height=576,framerate=25/1 ! x264enc ! mpegtsmux ! filesink  location=test.ts

  Now, for that video, i would like to add bookmarks for certain duration to directly skip the video to that duration, when click on that duration.

  How can i add bookmarks to that video ?

• ffmpeg command to insert the Static frames in a video, if the video has the gaps inside of it ?

  1er septembre 2020, par geo-freak

  I have a 10 min video file(.ts file), it has the gaps(empty video) from 4th min to 7th min. I want to insert the static frames from start of the gaps to end of the gap.

  


  I have a command to create the static video with null(silent) audio.

  


  ffmpeg -loop 1 -i img002.jpg -f lavfi -i anullsrc=channel_layout=5.1:sample_rate=48000 -c:v libx264 -t 10 -pix_fmt yuv420p -vf scale=480:320 -y output.ts


  


  I want to add this static video with silent audio in a a recording from specific period.

  


  How can I achieve it ?

  


  Thanks in advance.