Hello everybody, I'm trying to create a fragmented mp4 recording using ffmpeg API. I'm running on an ARM Linux system. I have two main purposes:
* Avoid corrupted recordings in case of system crash; * Allow user to play file while recording. Reading ffmpeg documentation (https://www.ffmpeg.org/ffmpeg-formats.html#mov_002c-mp4_002c-ismv) I used different combinations of these flags: * movflags frag_keyframe * movflags empty_moov * min_frag_duration The result is always the follow: 1. I start the recording; 2. A file is created in the output directory with size 28 B; 3. The size is kept until the end of the recording; 4. I stop the recording; 5. The file size increases until to reach the final size; 6. The file could be read with ffplay and/or VLC. If I shutdown the system while recording, the video is a 28 B file not playable. It seems ffmpeg keeps in memory the recording until the stop and only then it writes in file system. Using frag_keyframe and min_frag_duration in Windows I see the file increase its size while recording. What is the common behavior of ffmpeg fragmentation? Is file "buffering" expected? Can I activate some flag to flush the file periodically? Any idea to achieve my two goals? Thanks in advance, Simone Cilli
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