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

[Steven Liu]

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)