Okay, thank you. I will give that a go. -- aside --
I thought that the "-force_key_frames expr:gte(t,n_forced*2)" was placing the key frames for segment boundaries and still allowing the encoder to place other keyframes where they wanted? I am trying to use h264, h265, and vp9 so I figured the keyframes not at boundaries would need to be different for efficiency. How do I determine the best (or good) value for "-g" given a particular source file and target duration for segments? On Mon, Nov 18, 2019 at 10:19 AM Dennis Mungai <[email protected]> wrote: > On Mon, 18 Nov 2019 at 17:31, gordon <[email protected]> wrote: > > > Why are the segments for my stream not aligned? The first command > outputs > > video segment. The second command outputs an audio segment with the > > previous video output copied in. > > > > Ffmpeg commands are pasted below with the m3u8 outputs. The same results > > were observed on ffmpeg 4.2.1 and snapshot > > > > /usr/local/bin/ffmpeg -y -loglevel error -f rawvideo -vcodec rawvideo -s > > 160x120 -pix_fmt rgb24 -r 12.00 -i - -an -vcodec libx264 -preset medium > -f > > hls -an -hls_flags single_file -hls_time 6 -hls_list_size 0 > > -hls_segment_type mpegts -hls_segment_filename > > > > > /tmp/973b7b02b6e6486f90d3064527a69701/output/21b79578a1d04533932e32d28f46eb94.ts > > -hls_playlist_type vod -master_pl_name > > 21b79578a1d04533932e32d28f46eb94-master.m3u8 -force_key_frames > > 'expr:gte(t,n_forced*2)' -profile:v baseline -level 3.0 -pix_fmt yuv420p > > -vsync cfr -b 145k -pix_fmt yuv420p > > > > > /tmp/973b7b02b6e6486f90d3064527a69701/output/21b79578a1d04533932e32d28f46eb94-variant.m3u8 > > > > #EXTM3U > > #EXT-X-VERSION:4 > > #EXT-X-TARGETDURATION:6 > > #EXT-X-MEDIA-SEQUENCE:0 > > #EXT-X-PLAYLIST-TYPE:VOD > > #EXTINF:6.000000, > > #EXT-X-BYTERANGE:116748@0 > > 21b79578a1d04533932e32d28f46eb94.ts > > #EXTINF:6.000000, > > #EXT-X-BYTERANGE:96256@116748 > > 21b79578a1d04533932e32d28f46eb94.ts > > #EXTINF:6.000000, > > #EXT-X-BYTERANGE:143256@213004 > > 21b79578a1d04533932e32d28f46eb94.ts > > #EXTINF:6.000000, > > #EXT-X-BYTERANGE:97760@356260 > > 21b79578a1d04533932e32d28f46eb94.ts > > #EXTINF:5.750000, > > #EXT-X-BYTERANGE:75764@454020 > > 21b79578a1d04533932e32d28f46eb94.ts > > #EXT-X-ENDLIST > > > > > > /usr/local/bin/ffmpeg -y -loglevel error -f s16le -acodec pcm_s16le -ar > > 44100 -ac 2 -i - -i > > > > > /tmp/973b7b02b6e6486f90d3064527a69701/output/21b79578a1d04533932e32d28f46eb94.ts > > -vcodec copy -acodec libfdk_aac -ar 44100 -strict -2 -profile:a aac_he_v2 > > -vbr 1 -f hls -hls_flags single_file -hls_time 6 -hls_list_size 0 > > -hls_segment_type mpegts -hls_segment_filename > > > > > /tmp/973b7b02b6e6486f90d3064527a69701/output/e3658a88388c4d4da25681956bccb00f.ts > > -hls_playlist_type vod -master_pl_name > > e3658a88388c4d4da25681956bccb00f-master.m3u8 -force_key_frames > > 'expr:gte(t,n_forced*2)' -pix_fmt yuv420p -vsync cfr > > > > > /tmp/973b7b02b6e6486f90d3064527a69701/output/e3658a88388c4d4da25681956bccb00f-variant.m3u8 > > > > #EXTM3U > > #EXT-X-VERSION:4 > > #EXT-X-TARGETDURATION:6 > > #EXT-X-MEDIA-SEQUENCE:0 > > #EXT-X-PLAYLIST-TYPE:VOD > > #EXTINF:6.000000, > > #EXT-X-BYTERANGE:146452@0 > > e3658a88388c4d4da25681956bccb00f.ts > > #EXTINF:6.000000, > > #EXT-X-BYTERANGE:125020@146452 > > e3658a88388c4d4da25681956bccb00f.ts > > #EXTINF:5.916667, > > #EXT-X-BYTERANGE:167320@271472 > > e3658a88388c4d4da25681956bccb00f.ts > > #EXTINF:6.083333, > > #EXT-X-BYTERANGE:133856@438792 > > e3658a88388c4d4da25681956bccb00f.ts > > #EXTINF:5.750000, > > #EXT-X-BYTERANGE:103776@572648 > > e3658a88388c4d4da25681956bccb00f.ts > > #EXT-X-ENDLIST > > > > To ensure alignment, you must use a closed GOP (set via -flags +cgop) and > specify a GOP size via the -g option passed to your video encoder. > > > > > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
