Hi, I've been testing FFMPEG's HLS fragmented MP4 options with some M4A audio files.
I've noticed that if I ask ffmpeg to fragment an 11 minute file vs a 10 hour file, the byte ranges are different, even if the channel count/sampling rate/bit rate and codec are the same. Here's an example of what I'm talking about: #EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-MAP:URI="someAudio.m4s",BYTERANGE="738@0" #EXTINF:9.798821, #EXT-X-BYTERANGE:38977@738 someAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38735@39715 someAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38650@78450 someAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38688@117100 someAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38820@155788 someAudio.m4s And #EXTM3U #EXT-X-VERSION:6 #EXT-X-TARGETDURATION:10 #EXT-X-MEDIA-SEQUENCE:1 #EXT-X-MAP:URI="someOtherAudio.m4s",BYTERANGE="738@0" #EXTINF:9.798821, #EXT-X-BYTERANGE:38724@738 someOtherAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38812@39462 someOtherAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38632@78274 someOtherAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38804@116906 someOtherAudio.m4s #EXTINF:9.798821, #EXT-X-BYTERANGE:38720@155710 someOtherAudio.m4s Why would these byte ranges be different? I've been trying to look through the libavformat source code (https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/hlsenc.c <https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/hlsenc.c>) but it looks like this determination is done in whoever calls hls_write_packet. Thanks, Ronak _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
