HLS spec RFC 8216(https://tools.ietf.org/html/rfc8216) version 7 added supporting fMP4(CMAF) format for segment. However, when requesting seek operation, the hls demuxer doesn't work properly due to previous implementation of the HLS demuxer was only for supporting MPEG-TS format for segment.
So, I added procedure to reopen segment format on HLS demuxer when seeking requested. It's quite similar to MPEG-DASH demuxer(libavformat/dashdec.c) seeking procedure, as you know, MPEG-DASH also support fMP4(CMAF) format for fragment as default. Refer to https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/dashdec.c#L1904. Please test with below command: Server: $ ffmpeg -y -i {input} -vcodec libx264 \ -force_key_frames 30 \ -sc_threshold 0 \ -acodec aac \ -hls_segment_type fmp4 \ -hls_time 6 \ -hls_playlist_type vod \ -map 0:a -map 0:v -f hls \ -var_stream_map "a:0,agroup:aud,default:yes v:0,agroup:aud" \ -hls_segment_filename "segment_%v_%03d.m4s" \ -master_pl_name playlist.m3u8 \ hlscmaf_%v.m3u8 Player: $ ffplay playlist.m3u8 On 20. 7. 15. 오후 4:20, Dongwon Kim wrote: > Signed-off-by: Dongwon Kim <dongwon....@sk.com> > --- > libavformat/hls.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 67 insertions(+) > > diff --git a/libavformat/hls.c b/libavformat/hls.c > index ba17c4ed96..561b42ea6b 100644 > --- a/libavformat/hls.c > +++ b/libavformat/hls.c > @@ -2139,6 +2139,68 @@ static int compare_ts_with_wrapdetect(int64_t ts_a, > struct playlist *pls_a, > return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33); > } > +static int reopen_demux_for_component(AVFormatContext *s, struct playlist > *pls) > +{ > + ff_const59 AVInputFormat *in_fmt = NULL; > + AVDictionary *in_fmt_opts = NULL; > + uint8_t *avio_ctx_buffer = NULL; > + int ret = 0; > + > + if (pls->ctx) { > + av_freep(&pls->pb.buffer); > + memset(&pls->pb, 0x00, sizeof(AVIOContext)); > + pls->ctx->pb = NULL; > + avformat_close_input(&pls->ctx); > + pls->ctx = NULL; > + } > + > + if (ff_check_interrupt(&s->interrupt_callback)) { > + ret = AVERROR_EXIT; > + goto fail; > + } > + > + if (!(pls->ctx = avformat_alloc_context())) { > + ret = AVERROR(ENOMEM); > + goto fail; > + } > + > + avio_ctx_buffer = av_malloc(INITIAL_BUFFER_SIZE); > + if (!avio_ctx_buffer ) { > + ret = AVERROR(ENOMEM); > + avformat_free_context(pls->ctx); > + pls->ctx = NULL; > + goto fail; > + } > + ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, > pls, read_data, NULL, NULL); > + pls->pb.seekable = 0; > + > + if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0) > + goto fail; > + > + pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO; > + ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0); > + if (ret < 0) { > + av_log(s, AV_LOG_ERROR, "Error when loading segment, playlist %d\n", > pls->cur_seq_no); > + avformat_free_context(pls->ctx); > + pls->ctx = NULL; > + goto fail; > + } > + > + pls->ctx->pb = &pls->pb; > + pls->ctx->io_open = nested_io_open; > + > + ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); > + av_dict_free(&in_fmt_opts); > + if (ret < 0) > + goto fail; > + ret = avformat_find_stream_info(pls->ctx, NULL); > + if (ret < 0) > + goto fail; > + > +fail: > + return ret; > +} > + > static int hls_read_packet(AVFormatContext *s, AVPacket *pkt) > { > HLSContext *c = s->priv_data; > @@ -2351,6 +2413,11 @@ static int hls_read_seek(AVFormatContext *s, int > stream_index, > pls->seek_stream_index = -1; > pls->seek_flags |= AVSEEK_FLAG_ANY; > } > + > + if (pls->ctx && pls->ctx->iformat && strcmp(pls->ctx->iformat->name, > "mov,mp4,m4a,3gp,3g2,mj2") == 0) { > + pls->init_sec_buf_read_offset = 0; > + reopen_demux_for_component(s, pls); > + } > } > c->cur_timestamp = seek_timestamp; _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-requ...@ffmpeg.org with subject "unsubscribe".
