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Sur d’autres sites (10904)

  • How to record a livestream in ffmpeg or gstreamer and split the files without skipping or duplicating frames

    15 décembre 2020, par Blake Cochrane

    Can somone please recommend a solution for safely recording a live stream to a file that would not produce a corrupted file if the system was unsavely shut down.

    


    I am starting on a project using a battery powered Raspberry Pi 4B.
I am using GStreamer to use the ASIC for Raw Pi camera to h.264 compression to create a RTSP/HLS/RTMP stream.
I need to continuosly record the livestream to a file on the Pi without any duplicate & missing frames or transcoding - eg using -vcodec copy.
As the Pi is battery powered, it can be unsafely shut down randomly when the battery is out of energy.
I know that if a mp4 container isn't 'finalised' with the moov atom before the file finishes writing which would leave the file corrupted/unrepairable and unplayable.
So if I have an mp4 recording of 6 hours that is corrupted and unfixable that is a problem.
My idea was to split the recording to a new file after x amount of minutes or frames or bytes as losing the last few minutes is not so bad as to lose hours of recordings.
I would need to set the last frame in the old file as the previous frame to the next I frame (starting frame) in the new file as a h.264 stream can only start on an I frame.

    


    So it would go like this.
file 1
| Frame |0001|I|
| --- | --- | --- |
|Frame|0002|P|
|Frame|0003|B|
...
| Frame |1524|B|
| --- | --- | --- |
| Frame |1525|P|

    


    file 2
| Frame |1526|I|
| --- | --- | --- |
| Frame |1527|B|

    


    Then all of the split files can be appended to each other without transcoding in ffmpeg.
I don't need to record the live stream directly to an mp4, whatever container it is in can be converted to an mp4 when appending the split files.

    


    There is a python script of the Raspberry pi that accomplishes all of this but it can not be used for a live stream multicast as the Pi camera can not be accessed by more than one process at a time.
Unless there is a way to live stream the latest frames in an mp4 file that is continiously being recorded to, I am stuck.

    


  • Trim multiple clips with one command of FFmpeg

    1er août 2023, par Gabbar Singh
      


    1. I have a video called 1.mp4

      


      2. 


    2. I want to extract 17+17= 34 total clips from this video with one FFmpeg command

      


      3. 


    3. Each clip should have a unique name like 1a 1b 1c 1d and so on.

      


      4. 


    4. 17 clips will have a 1920x1080 dimension
and remaining 17 will have 720x720 dimension

      


      5. 


    5. I will appreciate if someone can help me to do this. It will save my several hours.

      


      6. 


    


  • Revision 37293 : Retour en arrière (suppression de la noisette)

    15 avril 2010, par joseph@… — Log

    Retour en arrière (suppression de la noisette)

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