Hi Vincent, Do not use -ss and -t parameters simultaneously. FFmpeg cannot form an output container well in that case.
If you just need to create HLS segments from some source file you can use the "segment" muxer. ffmpeg -i source.mp4 -vcodec copy -acodec copy -f ssegment -segment_list chunklist.m3u8 -segment_time 4 media_%04d.ts Chunk durations in such an approach may vary, because in your source file the distance between key-frames may vary. If you want to create HLS segments of exact length, then you must transcode your source file and provide exact frame rate -r and exact GOP -g . For example, if your source file has a frame rate of 25 frames per second, then to make HLS chunk duration of 4 second, you need to set GOP to 100 (or 50, or 25). To have 1 keyframe in each HLS chunk: -r 25 -g 100 To have 2 keyframes in each HLS chunk: -r 25 -g 50 To have 4 keyframes in each HLS chunk: -r 25 -g 25 So the final command may look like this: ffmpeg -i source.mp4 -r 25 -g 100 -c:v libx264 -preset fast -crf 24 -c:a aac -b:a 128k -f ssegment -segment_list chunklist.m3u8 -segment_time 4 media_%04d.ts German _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
