[FFmpeg-devel] [PATCH] avformat/segment: fix the duration error of use output_ts_offset

Steven Liu lingjiujianke at gmail.com
Fri Sep 9 11:33:57 EEST 2016


2016-09-09 16:10 GMT+08:00 Steven Liu <lingjiujianke at gmail.com>:

>
>
> 2016-09-09 15:33 GMT+08:00 Steven Liu <lingjiujianke at gmail.com>:
>
>>
>>
>> 2016-09-09 15:28 GMT+08:00 Aman Gupta <aman at tmm1.net>:
>>
>>> I tried your patch and TARGETDURATION is fixed, but it is still creating
>>> some segments which are only 0.2s instead of 2s.
>>>
>>> Aman
>>>
>>> On Thu, Sep 8, 2016 at 8:14 PM, Steven Liu <lingjiujianke at gmail.com>
>>> wrote:
>>>
>>>> This patch can merge with 1da00be009aa74400042bf470b9a5ffbd82a1c5e
>>>> i have checked this modify:
>>>>
>>>> ./ffmpeg -i ~/facebook.mp4 -c copy -f segment -segment_time 2
>>>> -output_ts_offset 80 -segment_list output-test.m3u8 -v debug
>>>> output-test-%03d.ts
>>>>
>>>> #EXTM3U
>>>> #EXT-X-VERSION:3
>>>> #EXT-X-MEDIA-SEQUENCE:0
>>>> #EXT-X-ALLOW-CACHE:YES
>>>> #EXT-X-TARGETDURATION:10
>>>> #EXTINF:4.120000,
>>>> output-test-000.ts
>>>> #EXTINF:7.840000,
>>>> output-test-001.ts
>>>> #EXTINF:4.200000,
>>>> output-test-002.ts
>>>> #EXTINF:2.920000,
>>>> output-test-003.ts
>>>> #EXTINF:1.840000,
>>>> output-test-004.ts
>>>> #EXTINF:2.240000,
>>>> output-test-005.ts
>>>> #EXTINF:2.000000,
>>>> output-test-006.ts
>>>> #EXTINF:3.560000,
>>>>
>>>>
>>>> [root at localhost linux]# ffmpeg -i output-test.m3u8
>>>> ffmpeg version N-80917-ga1a240b Copyright (c) 2000-2016 the FFmpeg
>>>> developers
>>>>   built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
>>>>   configuration: --prefix=/usr/ --libdir=/usr/lib64 --enable-libx264
>>>> --enable-libfaac --enable-gpl --enable-nonfree
>>>>   libavutil      55. 28.100 / 55. 28.100
>>>>   libavcodec     57. 48.102 / 57. 48.102
>>>>   libavformat    57. 41.100 / 57. 41.100
>>>>   libavdevice    57.  0.102 / 57.  0.102
>>>>   libavfilter     6. 47.100 /  6. 47.100
>>>>   libswscale      4.  1.100 /  4.  1.100
>>>>   libswresample   2.  1.100 /  2.  1.100
>>>>   libpostproc    54.  0.100 / 54.  0.100
>>>> Input #0, hls,applehttp, from 'output-test.m3u8':
>>>>   Duration: 00:03:21.04, start: 81.400000, bitrate: 0 kb/s
>>>>   Program 0
>>>>     Metadata:
>>>>       variant_bitrate : 0
>>>>     Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p,
>>>> 720x528 [SAR 1:1 DAR 15:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
>>>>     Stream #0:1: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
>>>> 5.1(side), fltp, 384 kb/s
>>>> At least one output file must be specified
>>>>
>>>>
>>>>
>>>> [root at localhost linux]# ffmpeg -i output-test-000.ts -i
>>>> output-test-001.ts
>>>> ffmpeg version N-80917-ga1a240b Copyright (c) 2000-2016 the FFmpeg
>>>> developers
>>>>   built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-17)
>>>>   configuration: --prefix=/usr/ --libdir=/usr/lib64 --enable-libx264
>>>> --enable-libfaac --enable-gpl --enable-nonfree
>>>>   libavutil      55. 28.100 / 55. 28.100
>>>>   libavcodec     57. 48.102 / 57. 48.102
>>>>   libavformat    57. 41.100 / 57. 41.100
>>>>   libavdevice    57.  0.102 / 57.  0.102
>>>>   libavfilter     6. 47.100 /  6. 47.100
>>>>   libswscale      4.  1.100 /  4.  1.100
>>>>   libswresample   2.  1.100 /  2.  1.100
>>>>   libpostproc    54.  0.100 / 54.  0.100
>>>> Input #0, mpegts, from 'output-test-000.ts':
>>>>   Duration: 00:00:04.12, start: 81.400000, bitrate: 1299 kb/s
>>>>   Program 1
>>>>     Metadata:
>>>>       service_name    : Service01
>>>>       service_provider: FFmpeg
>>>>     Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
>>>> yuv420p, 720x528 [SAR 1:1 DAR 15:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
>>>>     Stream #0:1[0x101](und): Audio: ac3 ([129][0][0][0] / 0x0081),
>>>> 48000 Hz, 5.1(side), fltp, 384 kb/s
>>>> Input #1, mpegts, from 'output-test-001.ts':
>>>>   Duration: 00:00:07.90, start: 85.464000, bitrate: 1679 kb/s
>>>>   Program 1
>>>>     Metadata:
>>>>       service_name    : Service01
>>>>       service_provider: FFmpeg
>>>>     Stream #1:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
>>>> yuv420p, 720x528 [SAR 1:1 DAR 15:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
>>>>     Stream #1:1[0x101](und): Audio: ac3 ([129][0][0][0] / 0x0081),
>>>> 48000 Hz, 5.1(side), fltp, 384 kb/s
>>>> At least one output file must be specified
>>>> [root at localhost linux]#
>>>>
>>>>
>>>>
>>>>
>>>> this commit is used for fix commit 1da00be009aa74400042bf470b9a5f
>>>> fbd82a1c5e
>>>> because the option initial_offset will deprecated
>>>>
>>>> Signed-off-by: Steven Liu <lingjiujianke at gmail.com>
>>>> ---
>>>>  libavformat/segment.c |    5 +++++
>>>>  1 files changed, 5 insertions(+), 0 deletions(-)
>>>>
>>>> diff --git a/libavformat/segment.c b/libavformat/segment.c
>>>> index 33a5cf0..252f8b1 100644
>>>> --- a/libavformat/segment.c
>>>> +++ b/libavformat/segment.c
>>>> @@ -885,6 +885,11 @@ calc_times:
>>>>          av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet
>>>> stream:%d pts:%s pts_time:%s frame:%d\n",
>>>>                 seg->avf->filename, pkt->stream_index,
>>>>                 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts,
>>>> &st->time_base), seg->frame_count);
>>>> +        seg->cut_pending = 0;
>>>> +        seg->cur_entry.index = seg->segment_idx +
>>>> seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
>>>> +        seg->cur_entry.start_time = (double)pkt->pts *
>>>> av_q2d(st->time_base);
>>>> +        seg->cur_entry.start_pts = av_rescale_q(pkt->pts,
>>>> st->time_base, AV_TIME_BASE_Q);
>>>> +        seg->cur_entry.end_time = seg->cur_entry.start_time;
>>>>      }
>>>>
>>>>      av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s
>>>> pts_time:%s dts:%s dts_time:%s",
>>>> --
>>>> 1.7.1
>>>>
>>>
>>> ok, let me try your command line
>>
>>
> ......
> it's reproduced when encode by default(video:mpeg2video  audio: mp2)
>
> Ha, interesting,
/ffmpeg -ss 20 -i ~/Movies/objectC/facebook.mp4 -g 50 -f segment
 -segment_time 2 -segment_start_number 10 -output_ts_offset 40
-segment_list output-test.m3u8 -v debug output-test-%03d.ts

no problem

./ffmpeg -ss 20 -i ~/Movies/objectC/facebook.mp4 -c:v mpeg2video -g 50 -f
segment  -segment_time 2 -segment_start_number 10 -output_ts_offset 40
-segment_list output-test.m3u8 -v debug output-test-%03d.ts

no problem

./ffmpeg -ss 20 -i ~/Movies/objectC/facebook.mp4 -c:v libx264 -g 50 -f
segment  -segment_time 2 -segment_start_number 10 -output_ts_offset 40
-segment_list output-test.m3u8 -v debug output-test-%03d.ts

no problem


./ffmpeg -ss 20 -i ~/Movies/objectC/facebook.mp4 -c copy -f segment
 -segment_time 2 -segment_start_number 10 -output_ts_offset 40
-segment_list output-test.m3u8 -v debug output-test-%03d.ts

no problem


./ffmpeg -ss 20 -i ~/Movies/objectC/facebook.mp4 -f segment  -segment_time
2 -segment_start_number 10 -output_ts_offset 40 -segment_list
output-test.m3u8 -v debug output-test-%03d.ts

reproduced


More information about the ffmpeg-devel mailing list