I tried ffplay on Ubuntu15.10, not expected result. seems buggy: ffplay.c, 3160, got packet with stream_index: 0 ffplay.c, 3160, got packet with stream_index: 2 ffplay.c, 3160, got packet with stream_index: 4 ffplay.c, 3160, got packet with stream_index: 0 ffplay.c, 3160, got packet with stream_index: 2 ffplay.c, 3160, got packet with stream_index: 4 ffplay.c, 3160, got packet with stream_index: 0 ffplay.c, 3160, got packet with stream_index: 2
2016-07-01 9:22 GMT+08:00 Halley Zhao <aihua.halley.z...@gmail.com>: > I tried it; but got unexpected result. > the pkt of discarded stream (stream_index) is still got from > av_read_frame(). > > my code is here: > https://github.com/halleyzhao/player-ffmpeg-yami/blob/m3u8/player.c > > ## the code piece is here: > #define MAX_TRACK_COUNT 10 > uint32_t video_tracks[MAX_TRACK_COUNT], video_track_count = 0; > uint32_t audio_tracks[MAX_TRACK_COUNT], audio_track_count = 0; > for (i = 0; i < pFormat->nb_streams; i++) { > if (pFormat->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { > video_tracks[video_track_count++] = i; > } else if (pFormat->streams[i]->codec->codec_type == > AVMEDIA_TYPE_AUDIO) { > audio_tracks[audio_track_count++] = i; > } > pFormat->streams[i]->discard = AVDISCARD_ALL; > } > > if (video_track_count) { > video_track_index = 0; > video_stream_index = video_tracks[video_track_index]; > pFormat->streams[video_stream_index]->discard = AVDISCARD_DEFAULT; > } > if (audio_track_count) { > audio_track_index = 0; > audio_stream_index = audio_tracks[audio_track_index]; > pFormat->streams[audio_stream_index]->discard = AVDISCARD_DEFAULT; > } > ## and the result is here: video track has index 0/2/4. when I set 0 > stream to AVDISCARD_DEFAULT and 2/4 to AVDISCARDALL, the pkt with > stream_index 2/4 still reach me. > player.c, 114, got pkt with stream_index: 0 > player.c, 114, got pkt with stream_index: 2 > player.c, 114, got pkt with stream_index: 4 > player.c, 114, got pkt with stream_index: 0 > player.c, 114, got pkt with stream_index: 2 > player.c, 114, got pkt with stream_index: 4 > player.c, 114, got pkt with stream_index: 0 > player.c, 114, got pkt with stream_index: 2 > player.c, 114, got pkt with stream_index: 3 > player.c, 114, got pkt with stream_index: 3 > player.c, 114, got pkt with stream_index: 4 > player.c, 114, got pkt with stream_index: 5 > player.c, 114, got pkt with stream_index: 5 > > 2016-06-29 19:25 GMT+08:00 aihua zhao <aihua.halley.z...@gmail.com>: > >> thanks, seems the right clue to follow. >> >> I don't know much about ffmpeg, after went through avplay.c. I think I >> should do the following steps >> 1. discard all stream by default. >> refer to decode_thread() >> for (i = 0; i < ic->nb_streams; i++) >> ic->streams[i]->discard = AVDISCARD_ALL; >> 2. enable the desired stream only >> refer to stream_component_open() >> ic->streams[stream_index]->discard = AVDISCARD_DEFAULT; >> >> thanks for your help. >> >> 2016-06-29 10:01 GMT+08:00 Steven Liu <lingjiujia...@gmail.com>: >> >>> 2016-06-29 8:36 GMT+08:00 aihua zhao <aihua.halley.z...@gmail.com>: >>> >>> > thanks. >>> > >>> > Yes, readahead the list is must. >>> > but during playback, I found ffmpeg downloads each content of the list >>> > -- av_read_frame() returns me each content with different stream_index. >>> > I'm expecting av_read_frame() returns me the interested stream only. >>> > I haven't found a way to do so; or said, is there ffmpeg interface to >>> > specify a dedicate stream (stream_index) to download. >>> > >>> > i'm looking into hls.c; there is recheck_discard_flags(), seems it is >>> > designed to do some policy like this. >>> > but I haven't found one top level interface of ffmpeg for it. >>> > recheck_discard_flags() is called once only during hls_read_packet() >>> when >>> > c->first_packet is set -- this flag is set in hls_read_header() only. >>> > >>> > >>> > 2016-06-28 22:22 GMT+08:00 Steven Liu <lingjiujia...@gmail.com>: >>> > >>> > > 2016-06-28 14:26 GMT+08:00 aihua zhao <aihua.halley.z...@gmail.com>: >>> > > >>> > > > Hi Experts: >>> > > > >>> > > > I use ffmpeg to parse/demux media content, and created a player >>> basing >>> > on >>> > > > it. >>> > > > >>> > > > here is a m3u8 content: >>> > > > >>> > > > >>> > > >>> > >>> http://asp.cntv.lxdns.com/asp/hls/main/0303000a/3/default/438eb7a818b246c187e72f1cd4e1bc4c/main.m3u8 >>> > > > < >>> > > > >>> > > >>> > >>> http://asp.cntv.lxdns.com/asp/hls/main/0303000a/3/default/438eb7a818b246c187e72f1cd4e1bc4c/main.m3u8?maxbr=1200 >>> > > > > >>> > > > there are three video track in it. >>> > > > >>> > > > I found all video/audio tracks are downloaded during playback, and >>> I >>> > can >>> > > > switch different track on the fly. >>> > > > however, it consumes much bandwidth since all tracks are >>> downloaded. >>> > > > >>> > > > even when I append bandwidth to the url; still the same result: >>> > > > >>> > > > >>> > > >>> > >>> http://asp.cntv.lxdns.com/asp/hls/main/0303000a/3/default/438eb7a818b246c187e72f1cd4e1bc4c/main.m3u8?maxbr=1200 >>> > > > >>> > > > Is there any way to download the specified track only to save >>> > bandwidth? >>> > > > >>> > > > thanks >>> > > > >>> > > >>> > > Hi Aihua Zhao, >>> > > >>> > > If you haven't read the m3u8 file and parse the playlist, and >>> read >>> > > the sub m3u8 playlist, how do you get the info of the mpegts? >>> > > >>> > > So it's must readahead the list and list all of the track for >>> > choose. >>> > you mean the function looks like "stream_cycle_channel" in ffplay? >>> > >>> _______________________________________________ >>> ffmpeg-devel mailing list >>> ffmpeg-devel@ffmpeg.org >>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel >>> >> >> > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
