Hi
I am looking to extract Closed Caption interlaced in userdata Frame
using libavcodec.
just now ffprobe does not say any thing about closed caption when I do
normal ffprobe
(gdb) r -analyzeduration 100000000 -probesize 2000000000
~/test_videos/test.ts
Starting program: /home/anshul/Software/ffmpeg/ffprobe_g
-analyzeduration 100000000 -probesize 2000000000 ~/test_videos/test.ts
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/libthread_db.so.1".
ffprobe version N-61086-g9477512 Copyright (c) 2007-2014 the FFmpeg
developers
built on Mar 5 2014 12:53:35 with gcc 4.7 (SUSE Linux)
configuration: --enable-libfaac --enable-libx264
--enable-memory-poisoning --enable-memalign-hack --enable-nonfree
--enable-gpl --enable-libfreetype --disable-optimizations
libavutil 52. 66.101 / 52. 66.101
libavcodec 55. 52.102 / 55. 52.102
libavformat 55. 33.101 / 55. 33.101
libavdevice 55. 11.100 / 55. 11.100
libavfilter 4. 2.100 / 4. 2.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 18.100 / 0. 18.100
libpostproc 52. 3.100 / 52. 3.100
Input #0, mpegts, from '/home/anshul/test_videos/test.ts':
Duration: 00:01:42.69, start: 1.433367, bitrate: 9901 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] /
0x0002), yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], max. 80000 kb/s,
29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
As I have seen that ffprobe -show_frames get into function
mpeg_decode_a53_cc and also in mpeg_field_start
but I dont find any way to extract the AVFrameSideData in my program as
i have copied the code snippet from mpeg_field_start
where it save a53_caption but I dont know the way to extract the caption.
1639 if (s1->a53_caption) {
1640 AVFrameSideData *sd = av_frame_new_side_data(
1641 &s->current_picture_ptr->f, AV_FRAME_DATA_A53_CC,
1642 s1->a53_caption_size);
1643 if (sd)
1644 memcpy(sd->data, s1->a53_caption,
s1->a53_caption_size);
1645 av_freep(&s1->a53_caption);
1646 }
Thanks
Anshul Maheshwari
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