[FFmpeg-devel] HLS Segmenter and the "hls_time" option
Steven Liu
lingjiujianke at gmail.com
Fri Aug 26 09:36:45 EEST 2016
2016-08-26 14:00 GMT+08:00 Steven Liu <lingjiujianke at gmail.com>:
>
>
> 2016-08-26 10:34 GMT+08:00 Ibrahim Tachijian <barhom at netsat.se>:
>
>> In my use case scenario I only need it for the very first couple of
>> segments.
>> After 5 segments it is not a problem anymore to have 5 second segments
>> only.
>>
>>
>>
>> On Fri, Aug 26, 2016 at 4:25 AM Steven Liu <lingjiujianke at gmail.com>
>> wrote:
>>
>> > 2016-08-26 10:10 GMT+08:00 Ibrahim Tachijian <barhom at netsat.se>:
>> >
>> > > yes that is correct Steven.
>> > >
>> > > On Fri, Aug 26, 2016 at 3:41 AM Steven Liu <lingjiujianke at gmail.com>
>> > > wrote:
>> > >
>> > > > 2016-08-26 8:17 GMT+08:00 Ibrahim Tachijian <barhom at netsat.se>:
>> > > >
>> > > > > Steven, I am not sure you understood me correctly or perhaps I did
>> > not
>> > > > > explain myself optimally.
>> > > > >
>> > > > > We still want to split by keyframe in a normal fashion. But, for
>> > > example,
>> > > > > would like the first 5 segments to have an "hls_time" of 1s and
>> the
>> > > rest
>> > > > of
>> > > > > the segments after the first 5 to have an "hls_time" of 5s.
>> > > > >
>> > > > > An made up option would be (hls_time_initial Seconds,Number)
>> > > > >
>> > > > > - "-hls_time_initial 1,5 -hls_time 5"
>> > > > >
>> > > > > The output playlist would contain segments (split at keyframes) 5
>> > > > segments
>> > > > > of length 1s and then any segment after the initial 5 segment
>> would
>> > be
>> > > > 5s.
>> > > > >
>> > > > > Is it clear what I am trying to explain?
>> > > > >
>> > > > > What do you think? Do you know how this can be achieved?
>> > > > >
>> > > > > Thanks,
>> > > > >
>> > > > > On Fri, Aug 26, 2016 at 2:06 AM Steven Liu <
>> lingjiujianke at gmail.com>
>> > > > > wrote:
>> > > > >
>> > > > > > 2016-08-26 7:39 GMT+08:00 Ibrahim Tachijian <barhom at netsat.se>:
>> > > > > >
>> > > > > > > Hello,
>> > > > > > >
>> > > > > > > I've been thinking about an option for "hls_time" that is not
>> > > > currently
>> > > > > > > supported by FFMpeg and I would like feedback to if some of
>> you
>> > may
>> > > > > think
>> > > > > > > this is useful or utterly unnecessary.
>> > > > > > >
>> > > > > > > I find scenarios where we sometimes want to create an HLS
>> output
>> > > and
>> > > > > > would
>> > > > > > > like the *first couple of segments* to be shorter than the
>> *rest
>> > of
>> > > > the
>> > > > > > > segments.*
>> > > > > > >
>> > > > > > > For example starting off with 1s segments up to N segments
>> then
>> > > > switch
>> > > > > to
>> > > > > > > 5s segments.
>> > > > > > >
>> > > > > > > The reasoning is simply to have the playlist.m3u8 and first
>> > segment
>> > > > > > > available *asap.*
>> > > > > > >
>> > > > > > > What do you think? Do you know how this can be achieved?
>> > > > > > >
>> > > > > > > Thanks,
>> > > > > > >
>> > > > > >
>> > > > > > ffmpeg split segment use hlsenc by keyframe, if you want to
>> split
>> > > > segment
>> > > > > > *ASAP*,
>> > > > > > you can try set your streaming *GOP(Group Of Picture)* shorter,
>> > > > > > for example: gop_size = 60, c->time_base = (AVRational){1,60};
>> > > > > > in command line : -r:v 60 -g 60
>> > > > > >
>> > > > > > if can accept split segment at non-keyframe, you can use
>> hls_time
>> > and
>> > > > > > hls_flags split_by_time.
>> > > > > > _______________________________________________
>> > > > >
>> > > > you mean:
>> > > >
>> > > > segment-0.ts,segment-1.ts,segment-2.ts,segment-3.ts,segment-4.ts
>> these
>> > > 5
>> > > > segments duration is 1s
>> > > > and
>> > > > segment-5.ts,segment-6.ts,segment-7.ts ...... these segment
>> duration is
>> > > 5
>> > > > or set by hls_time
>> > > > Is that right i understand?
>> > >
>> > >
>> > OK , Thanks.
>> > That a good idea, but i have a question:
>> > when ffmpeg update the segment list after 10 segments, there have a new
>> > user to play the hls playlist, the m3u8 segments every ts segments'
>> > duration is the 5s.
>> > So do you want exec a new ffmpeg when every one play the hls playlist ?
>>
>>
> Dose this patch can fix your request?
>
>
> update patch
Test process:
localhost:ffmpeg liuqi$ ./ffmpeg -v verbose -re -i
~/Movies/objectC/facebook.mp4 -c copy -f hls -hls_time 3 -hls_list_size 3
-hls_flags split_by_time aaaa_output.m3u8
ffmpeg version N-81462-gbcd1153 Copyright (c) 2000-2016 the FFmpeg
developers
built with Apple LLVM version 7.3.0 (clang-703.0.31)
configuration: --enable-fontconfig --enable-gpl --enable-libass
--enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libspeex --enable-libx264 --enable-libx265 --enable-version3
libavutil 55. 29.100 / 55. 29.100
libavcodec 57. 54.100 / 57. 54.100
libavformat 57. 48.100 / 57. 48.100
libavdevice 57. 0.102 / 57. 0.102
libavfilter 6. 55.100 / 6. 55.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
[h264 @ 0x7f94f1813c00] Reinit context to 1280x720, pix_fmt: yuv420p
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/Users/liuqi/Movies/objectC/facebook.mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
creation_time : 2015-02-02 18:19:19
Duration: 00:45:02.06, start: 0.000000, bitrate: 2708 kb/s
Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 /
0x31637661), yuv420p, 1280x714 (1280x720) [SAR 1:1 DAR 640:357], 2576 kb/s,
25 fps, 25 tbr, 25k tbn, 50 tbc (default)
Metadata:
creation_time : 2015-02-02 18:19:19
handler_name : GPAC ISO Video Handler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 127 kb/s (default)
Metadata:
creation_time : 2015-02-02 18:19:23
handler_name : GPAC ISO Audio Handler
[hls @ 0x7f94f3004800] Using AVStream.codec to pass codec parameters to
muxers is deprecated, use AVStream.codecpar instead.
Last message repeated 1 times
[mpegts @ 0x7f94f180b800] muxrate VBR, pcr every 5 pkts, sdt every
2147483647, pat/pmt every 2147483647 pkts
Output #0, hls, to 'aaaa_output.m3u8':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
encoder : Lavf57.48.100
Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 /
0x31637661), yuv420p, 1280x714 (0x0) [SAR 1:1 DAR 640:357], q=2-31, 2576
kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
Metadata:
creation_time : 2015-02-02 18:19:19
handler_name : GPAC ISO Video Handler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, 127 kb/s (default)
Metadata:
creation_time : 2015-02-02 18:19:23
handler_name : GPAC ISO Audio Handler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
Automatically inserted bitstream filter 'h264_mp4toannexb'; args=''
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:00:03.04 bitrate=N/A speed= 1x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:00:06.12 bitrate=N/A speed=1.01x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:00:08.64 bitrate=N/A speed= 1x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:10:11.73 bitrate=N/A speed= 1x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:20:14.74 bitrate=N/A speed= 1x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:30:17.76 bitrate=N/A speed= 1x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:40:20.84 bitrate=N/A speed= 1x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:50:23.89 bitrate=N/A speed= 1x
[hls @ 0x7f94f3004800] EXT-X-MEDIA-SEQUENCE:6
frame= 601 fps= 25 q=-1.0 Lsize=N/A time=00:00:24.29 bitrate=N/A speed=
1x
video:7099kB audio:370kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
Input file #0 (/Users/liuqi/Movies/objectC/facebook.mp4):
Input stream #0:0 (video): 601 packets read (7269480 bytes);
Input stream #0:1 (audio): 1139 packets read (379370 bytes);
Total: 1740 packets (7648850 bytes) demuxed
Output file #0 (aaaa_output.m3u8):
Output stream #0:0 (video): 601 packets muxed (7269480 bytes);
Output stream #0:1 (audio): 1139 packets muxed (379370 bytes);
Total: 1740 packets (7648850 bytes) muxed
localhost:ffmpeg liuqi$
localhost:ffmpeg liuqi$ ./ffmpeg -v verbose -re -i
~/Movies/objectC/facebook.mp4 -c copy -f hls -hls_init_time 1 -hls_time 5
-hls_flags split_by_time output_test.m3u8
ffmpeg version N-81462-gbcd1153 Copyright (c) 2000-2016 the FFmpeg
developers
built with Apple LLVM version 7.3.0 (clang-703.0.31)
configuration: --enable-fontconfig --enable-gpl --enable-libass
--enable-libbluray --enable-libfreetype --enable-libmp3lame
--enable-libspeex --enable-libx264 --enable-libx265 --enable-version3
libavutil 55. 29.100 / 55. 29.100
libavcodec 57. 54.100 / 57. 54.100
libavformat 57. 48.100 / 57. 48.100
libavdevice 57. 0.102 / 57. 0.102
libavfilter 6. 55.100 / 6. 55.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
[h264 @ 0x7fedf4017600] Reinit context to 1280x720, pix_fmt: yuv420p
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
'/Users/liuqi/Movies/objectC/facebook.mp4':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
creation_time : 2015-02-02 18:19:19
Duration: 00:45:02.06, start: 0.000000, bitrate: 2708 kb/s
Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 /
0x31637661), yuv420p, 1280x714 (1280x720) [SAR 1:1 DAR 640:357], 2576 kb/s,
25 fps, 25 tbr, 25k tbn, 50 tbc (default)
Metadata:
creation_time : 2015-02-02 18:19:19
handler_name : GPAC ISO Video Handler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 127 kb/s (default)
Metadata:
creation_time : 2015-02-02 18:19:23
handler_name : GPAC ISO Audio Handler
[hls @ 0x7fedf4000600] Using AVStream.codec to pass codec parameters to
muxers is deprecated, use AVStream.codecpar instead.
Last message repeated 1 times
[mpegts @ 0x7fedf3008a00] muxrate VBR, pcr every 5 pkts, sdt every
2147483647, pat/pmt every 2147483647 pkts
Output #0, hls, to 'output_test.m3u8':
Metadata:
major_brand : isom
minor_version : 1
compatible_brands: isomavc1
encoder : Lavf57.48.100
Stream #0:0(und): Video: h264 (High), 1 reference frame (avc1 /
0x31637661), yuv420p, 1280x714 (0x0) [SAR 1:1 DAR 640:357], q=2-31, 2576
kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
Metadata:
creation_time : 2015-02-02 18:19:19
handler_name : GPAC ISO Video Handler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, 127 kb/s (default)
Metadata:
creation_time : 2015-02-02 18:19:23
handler_name : GPAC ISO Audio Handler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
Automatically inserted bitstream filter 'h264_mp4toannexb'; args=''
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:00:00.52 bitrate=N/A speed=1.02x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:00:01.56 bitrate=N/A speed=1.03x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:00:03.08 bitrate=N/A speed=1.01x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:00:03.56 bitrate=N/A speed= 1x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:00:05.12 bitrate=N/A speed=1.01x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:10:06.12 bitrate=N/A speed= 1x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:20:09.70 bitrate=N/A speed= 1x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:30:14.80 bitrate=N/A speed= 1x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:40:19.88 bitrate=N/A speed= 1x
[hls @ 0x7fedf4000600] EXT-X-MEDIA-SEQUENCE:50:20.90 bitrate=N/A speed= 1x
frame= 529 fps= 25 q=-1.0 Lsize=N/A time=00:00:21.35 bitrate=N/A speed=
1x
video:6506kB audio:324kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: unknown
Input file #0 (/Users/liuqi/Movies/objectC/facebook.mp4):
Input stream #0:0 (video): 529 packets read (6661710 bytes);
Input stream #0:1 (audio): 1001 packets read (332091 bytes);
Total: 1530 packets (6993801 bytes) demuxed
Output file #0 (output_test.m3u8):
Output stream #0:0 (video): 529 packets muxed (6661710 bytes);
Output stream #0:1 (audio): 1001 packets muxed (332091 bytes);
Total: 1530 packets (6993801 bytes) muxed
localhost:ffmpeg liuqi$
And recover segments duration time by hls_time after init hls window.
This is reuqested by Ibrahim Tachijian
Signed-off-by: LiuQi <liuqi at gosun.com>
---
libavformat/hlsenc.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index e65f002..f5ceb60 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -85,6 +85,7 @@ typedef struct HLSContext {
AVFormatContext *vtt_avf;
float time; // Set by a private option.
+ float init_time; // Set by a private option.
int max_nb_segments; // Set by a private option.
int wrap; // Set by a private option.
uint32_t flags; // enum HLSFlags
@@ -706,7 +707,7 @@ static int hls_write_header(AVFormatContext *s)
int vtt_basename_size;
hls->sequence = hls->start_sequence;
- hls->recording_time = hls->time * AV_TIME_BASE;
+ hls->recording_time = (hls->init_time ? hls->init_time : hls->time) *
AV_TIME_BASE;
hls->start_pts = AV_NOPTS_VALUE;
if (hls->format_options_str) {
@@ -860,9 +861,19 @@ static int hls_write_packet(AVFormatContext *s,
AVPacket *pkt)
AVStream *st = s->streams[pkt->stream_index];
int64_t end_pts = hls->recording_time * hls->number;
int is_ref_pkt = 1;
+ int init_list_dur = 0;
+ int after_init_list_dur = 0;
int ret, can_split = 1;
int stream_index = 0;
+ if (hls->sequence - hls->nb_entries > hls->start_sequence &&
hls->init_time > 0) {
+ /* reset end_pts, hls->recording_time at end of the init hls list
*/
+ init_list_dur = hls->init_time * hls->nb_entries * AV_TIME_BASE;
+ after_init_list_dur = (hls->sequence - hls->nb_entries ) *
hls->time * AV_TIME_BASE;
+ hls->recording_time = hls->time * AV_TIME_BASE;
+ end_pts = init_list_dur + after_init_list_dur ;
+ }
+
if( st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE ) {
oc = hls->vtt_avf;
stream_index = 0;
@@ -972,6 +983,7 @@ static int hls_write_trailer(struct AVFormatContext *s)
static const AVOption options[] = {
{"start_number", "set first number in the sequence",
OFFSET(start_sequence),AV_OPT_TYPE_INT64, {.i64 = 0}, 0, INT64_MAX,
E},
{"hls_time", "set segment length in seconds",
OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E},
+ {"hls_init_time", "set segment length in seconds at init list",
OFFSET(init_time), AV_OPT_TYPE_FLOAT, {.dbl = 0}, 0, FLT_MAX,
E},
{"hls_list_size", "set maximum number of playlist entries",
OFFSET(max_nb_segments), AV_OPT_TYPE_INT, {.i64 = 5}, 0,
INT_MAX, E},
{"hls_ts_options","set hls mpegts list of options for the container
format used for hls", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str
= NULL}, 0, 0, E},
{"hls_vtt_options","set hls vtt list of options for the container
format used for hls", OFFSET(vtt_format_options_str), AV_OPT_TYPE_STRING,
{.str = NULL}, 0, 0, E},
--
2.7.4 (Apple Git-66)
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