Hi there. I'm asking here now as I've been banging my head on this for a while now and can't find a solution. Seeing that the file I'm analysing was creating using libavformat ; I'm hoping someone here would know...
So here I have an init segment: http://people.mozilla.org/~jyavenard/mediatest/fragmented/facebook-paper_dash.mp4 Now, all movie headers (mvhd atom), media header (mdhd) or track headers (tkhd atoms) indicate that the duration is 0. (can check with this page: http://people.mozilla.org/~jyavenard/tests/mse_mp4/paper-init.html) Yet, IE11 and Chrome reads the duration as 120.187s which makes sense as the original mp4 I extracted it from was 2 minutes long. Here is the details of this mp4 init segment: [ftyp] size=8+28 major_brand = isom minor_version = 200 compatible_brand = isom compatible_brand = iso2 compatible_brand = avc1 compatible_brand = mp41 compatible_brand = dash [free] size=8+47 [moov] size=8+1168 [mvhd] size=12+96 timescale = 1000 duration = 0 duration(ms) = 0 [mvex] size=8+64 [trex] size=12+20 track id = 1 default sample description index = 1 default sample duration = 1001 default sample size = 0 default sample flags = 10000 [trex] size=12+20 track id = 2 default sample description index = 1 default sample duration = 1024 default sample size = 0 default sample flags = 0 [trak] size=8+467 [tkhd] size=12+80, flags=f enabled = 1 id = 1 duration = 0 width = 1920.000000 height = 1080.000000 [mdia] size=8+367 [mdhd] size=12+20 timescale = 30000 duration = 0 duration(ms) = 0 language = eng [hdlr] size=12+33 handler_type = vide handler_name = VideoHandler [minf] size=8+282 [vmhd] size=12+8, flags=1 graphics_mode = 0 op_color = 0000,0000,0000 [dinf] size=8+28 [dref] size=12+16 [url ] size=12+0, flags=1 location = [local to file] [stbl] size=8+218 [stsd] size=12+138 entry-count = 1 [avc1] size=8+126 data_reference_index = 1 width = 1920 height = 1080 compressor = [avcC] size=8+40 Configuration Version = 1 Profile = Main Profile Compatibility = 40 Level = 31 NALU Length Size = 4 Sequence Parameter = [67 4d 40 1f ec c0 3c 01 13 f2 e0 22 00 00 07 d2 00 01 d4 c0 1e 30 63 34] Picture Parameter = [68 e9 78 f2 c8] [stts] size=12+4 entry_count = 0 [stsc] size=12+4 entry_count = 0 [stsz] size=12+8 sample_size = 0 sample_count = 0 [stco] size=12+4 entry_count = 0 [trak] size=8+407 [tkhd] size=12+80, flags=f enabled = 1 id = 2 duration = 0 width = 0.000000 height = 0.000000 [mdia] size=8+307 [mdhd] size=12+20 timescale = 48000 duration = 0 duration(ms) = 0 language = eng [hdlr] size=12+33 handler_type = soun handler_name = SoundHandler [minf] size=8+222 [smhd] size=12+4 balance = 0 [dinf] size=8+28 [dref] size=12+16 [url ] size=12+0, flags=1 location = [local to file] [stbl] size=8+162 [stsd] size=12+82 entry-count = 1 [mp4a] size=8+70 data_reference_index = 1 channel_count = 2 sample_size = 16 sample_rate = 48000 [esds] size=12+30 [ESDescriptor] size=2+28 es_id = 2 stream_priority = 0 [DecoderConfig] size=2+20 stream_type = 5 object_type = 64 up_stream = 0 buffer_size = 0 max_bitrate = 192082 avg_bitrate = 192082 DecoderSpecificInfo = 11 90 56 e5 00 [Descriptor:06] size=2+1 [stts] size=12+4 entry_count = 0 [stsc] size=12+4 entry_count = 0 [stsz] size=12+8 sample_size = 0 sample_count = 0 [stco] size=12+4 entry_count = 0 [udta] size=8+90 [meta] size=12+78 [hdlr] size=12+21 handler_type = mdir handler_name = [ilst] size=8+37 [.too] size=8+29 [data] size=8+21 type = 1 lang = 0 value = Lavf55.12.100 I can't for the life of me figure out where it's getting that 120.187s duration... Any ideas? thanks _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user
