[FFmpeg-trac] #5763(avformat:new): copy via HTTP with no transcode very slow for MOV vs. MP4
FFmpeg
trac at avcodec.org
Thu Aug 18 12:18:26 EEST 2016
#5763: copy via HTTP with no transcode very slow for MOV vs. MP4
--------------------------------------+------------------------------------
Reporter: dheidebrecht | Owner:
Type: defect | Status: new
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: mov | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
--------------------------------------+------------------------------------
Changes (by cehoyos):
* keywords: => mov
* component: ffmpeg => avformat
Comment:
The fact that FFmpeg seeks wildly in the original mov file (but not in a
file remuxed with FFmpeg) leading to many slow reconnections is
reproducible with the following command line:
{{{
$ ffmpeg -loglevel debug -i test.mov -c copy -f null -
ffmpeg version N-81379-gf866f22 Copyright (c) 2000-2016 the FFmpeg
developers
built with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --enable-gnutls
libavutil 55. 28.100 / 55. 28.100
libavcodec 57. 53.100 / 57. 53.100
libavformat 57. 47.101 / 57. 47.101
libavdevice 57. 0.102 / 57. 0.102
libavfilter 6. 52.100 / 6. 52.100
libswscale 4. 1.100 / 4. 1.100
libswresample 2. 1.100 / 2. 1.100
libpostproc 54. 0.100 / 54. 0.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument 'debug'.
Reading option '-i' ... matched as input file with argument 'test.mov'.
Reading option '-c' ... matched as option 'c' (codec name) with argument
'copy'.
Reading option '-f' ... matched as option 'f' (force format) with argument
'null'.
Reading option '-' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Successfully parsed a group of options.
Parsing a group of options: input file test.mov.
Successfully parsed a group of options.
Opening an input file: test.mov.
[file @ 0x28a4e80] Setting default whitelist 'file,crypto'
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] Format mov,mp4,m4a,3gp,3g2,mj2
probed with size=2048 and score=100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] ISO: File Type Major Brand: qt
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] Unknown dref type 0x0873696c61 size
12
Last message repeated 3 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] rfps: 29.833333 0.019205
Last message repeated 1 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] rfps: 29.916667 0.003699
Last message repeated 1 times
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] rfps: 30.000000 0.000558
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] rfps: 60.000000 0.002233
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] rfps: 120.000000 0.008934
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] rfps: 29.970030 0.000264
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] rfps: 59.940060 0.001055
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] Before avformat_find_stream_info()
pos: 87380080 bytes read:53138 seeks:1 nb_streams:4
[h264 @ 0x28a66a0] nal_unit_type: 7, nal_ref_idc: 1
[h264 @ 0x28a66a0] nal_unit_type: 8, nal_ref_idc: 1
[h264 @ 0x28a66a0] nal_unit_type: 6, nal_ref_idc: 0
[h264 @ 0x28a66a0] nal_unit_type: 5, nal_ref_idc: 1
[h264 @ 0x28a66a0] Reinit context to 1920x1088, pix_fmt: yuv420p
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] All info found
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x28a4640] After avformat_find_stream_info()
pos: 206381 bytes read:259483 seeks:2 frames:45
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mov':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
creation_time : 2016-07-31 22:04:54
com.apple.quicktime.location.ISO6709: +41.3207-071.9074-000.385/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 6s
com.apple.quicktime.software: 9.3.3
com.apple.quicktime.creationdate: 2016-07-31T18:04:54-0400
Duration: 00:00:40.80, start: 0.000000, bitrate: 17134 kb/s
Stream #0:0(und), 1, 1/600: Video: h264 (High), 1 reference frame
(avc1 / 0x31637661), yuv420p(tv, bt709, left), 1920x1080 (1920x1088), 0/1,
17042 kb/s, 29.98 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
Metadata:
creation_time : 2016-07-31 22:04:54
handler_name : Core Media Data Handler
encoder : H.264
Stream #0:1(und), 44, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D),
44100 Hz, mono, fltp, 82 kb/s (default)
Metadata:
creation_time : 2016-07-31 22:04:54
handler_name : Core Media Data Handler
Stream #0:2(und), 0, 1/600: Data: none (mebx / 0x7862656D), 0/1, 0
kb/s (default)
Metadata:
creation_time : 2016-07-31 22:04:54
handler_name : Core Media Data Handler
Stream #0:3(und), 0, 1/600: Data: none (mebx / 0x7862656D), 0/1, 0
kb/s (default)
Metadata:
creation_time : 2016-07-31 22:04:54
handler_name : Core Media Data Handler
Successfully opened the file.
Parsing a group of options: output file -.
Applying option c (codec name) with argument copy.
Applying option f (force format) with argument null.
Successfully parsed a group of options.
Opening an output file: -.
Successfully opened the file.
[null @ 0x28f2a60] Using AVStream.codec to pass codec parameters to muxers
is deprecated, use AVStream.codecpar instead.
Last message repeated 1 times
Output #0, null, to 'pipe:':
Metadata:
major_brand : qt
minor_version : 0
compatible_brands: qt
com.apple.quicktime.creationdate: 2016-07-31T18:04:54-0400
com.apple.quicktime.location.ISO6709: +41.3207-071.9074-000.385/
com.apple.quicktime.make: Apple
com.apple.quicktime.model: iPhone 6s
com.apple.quicktime.software: 9.3.3
encoder : Lavf57.47.101
Stream #0:0(und), 0, 1/600: Video: h264 (High), 1 reference frame
(avc1 / 0x31637661), yuv420p(tv, bt709, left), 1920x1080 (0x0), 0/1,
q=2-31, 17042 kb/s, 29.98 fps, 29.97 tbr, 600 tbn, 600 tbc (default)
Metadata:
creation_time : 2016-07-31 22:04:54
handler_name : Core Media Data Handler
encoder : H.264
Stream #0:1(und), 0, 1/44100: Audio: aac (LC) (mp4a / 0x6134706D),
44100 Hz, mono, 82 kb/s (default)
Metadata:
creation_time : 2016-07-31 22:04:54
handler_name : Core Media Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid (this is harmless if it occurs once at the start per
stream)
Last message repeated 45 times
No more output streams to write to, finishing.
frame= 1223 fps=0.0 q=-1.0 Lsize=N/A time=00:00:40.86 bitrate=N/A
speed=1.43e+03x
video:84872kB audio:413kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: unknown
Input file #0 (test.mov):
Input stream #0:0 (video): 1223 packets read (86909375 bytes);
Input stream #0:1 (audio): 1760 packets read (423378 bytes);
Input stream #0:2 (data): 0 packets read (0 bytes);
Input stream #0:3 (data): 0 packets read (0 bytes);
Total: 2983 packets (87332753 bytes) demuxed
Output file #0 (pipe:):
Output stream #0:0 (video): 1223 packets muxed (86909375 bytes);
Output stream #0:1 (audio): 1760 packets muxed (423378 bytes);
Total: 2983 packets (87332753 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x28a5160] Statistics: 127025736 bytes read, 2419 seeks
}}}
I don't know if there is a bug that can be fixed in FFmpeg.
--
Ticket URL: <https://trac.ffmpeg.org/ticket/5763#comment:2>
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