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  • ffmpeg video encode .mp4 for webserver

    23 août 2016, par Nandex Sierra

    I have a lot of mini-videos (from 1 to 10 seconds) and the size of each is about 5-10MB. I have a Apache server and I want to reproduce the videos from the url (http://localhost/videoX.mp4)

    I have a big problem, the video takes to start about 12seconds and I think that this is a lot of time. Somebody knows how encode the video or a platform to upload my videos ??

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  • FFmpeg capture, mkvtimestamp_v2 and timecode don't play nice

    24 mai 2021, par Bouke

    Trying to capture and modify the TC in-file afterwards.
I've found a nice way to store the timestamps from the capture.
Gyan's brillant filterchain

    


    This works fine using this line :

    


    ffmpeg -hide_banner -f "decklink" -queue_size "1073741824" -raw_format "auto" -format_code "Hi50" -video_input "sdi" -i "bm mini One" -filter_complex "settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/25/TB[out]" -map "[out]" -c:a "copy" -c:v "prores" -profile:v "1" -vendor "ap10" -pix_fmt "yuv422p10le" "/Volumes/Data/tst1.mov" -map "[ts]" -f mkvtimestamp_v2 "/Volumes/Data/time.txt" -vsync 0


    


    But, when I add -timecode "00:00:00:00" (to force a TC atom in the output), horrible things happen.

    


    ffmpeg -f "decklink" -queue_size "1073741824" -raw_format "auto" -format_code "Hi50" -video_input "sdi" -i "bm mini One" -filter_complex "settb=1/1000,setpts=RTCTIME/1000-1500000000000,mpdecimate,split[out][ts];[out]setpts=N/25/TB[out]" -map "[out]" -timecode "00:01:00:00" -c:a "copy" -c:v "prores" -profile:v "1" -vendor "ap10" -pix_fmt "yuv422p10le" "/Volumes/Data/tst1.mov" -map "[ts]" -f mkvtimestamp_v2 "/Volumes/Data/time.txt" -vsync 0


    


    The timecode does not run at the video speed, skips a frame or two here and there, and the image freezes after a random amount of time (between 10 seconds and a minute or so).

    


    How come the timecode can mess up stuff that much ? From what I understand it's just a couple of atoms in the moov atom, and a reference where the actual TC value (as frames) is stored in the mdat.

    


    I highly suspect the -vsync 0 to also work on the video, and I've had issues with that before. If I omit that, the video is fine, the TC is fine, but there is no metadata output, just the # timecode format v2

    


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