[FFmpeg-trac] #1159(undetermined:new): framecrc documentation is out of date
FFmpeg
trac at avcodec.org
Mon Apr 2 06:25:10 CEST 2012
#1159: framecrc documentation is out of date
-------------------------------------+-------------------------------------
Reporter: dericed | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: framecrc | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
From http://ffmpeg.org/ffmpeg.html#framecrc: "The output of the muxer
consists of a line for each audio and video frame of the form:
stream_index, frame_dts, frame_size, 0xCRC, where CRC is a hexadecimal
number 0-padded to 8 digits containing the CRC of the decoded frame."
To create a framecrc output I used this source file,
http://archive.org/download/SoundieF/SoundieF.mpeg, and this command:
{{{
ffmpeg started on 2012-04-02 at 00:17:48
Report written to "ffmpeg-20120402-001748.log"
Command line:
ffmpeg -report -t 0.1 -i SoundieF.mpeg -f framecrc SoundieF.framecrc
ffmpeg version N-35765-gf9143d2 Copyright (c) 2000-2012 the FFmpeg
developers
built on Mar 31 2012 12:44:33 with llvm_gcc 4.2.1 (Based on Apple Inc.
build 5658) (LLVM build 2335.15.00)
configuration: --prefix=/usr/local/Cellar/ffmpeg/HEAD --enable-shared
--enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables
--enable-libfreetype --cc=/usr/bin/llvm-gcc --enable-libx264 --enable-
libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis
--enable-libvpx --enable-libxvid --enable-libopencore-amrnb --enable-
libopencore-amrwb --enable-libass --disable-ffplay
libavutil 51. 44.100 / 51. 44.100
libavcodec 54. 12.100 / 54. 12.100
libavformat 54. 3.100 / 54. 3.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 66.101 / 2. 66.101
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 10.100 / 0. 10.100
libpostproc 52. 0.100 / 52. 0.100
[mpeg @ 0x7f9eea84b400] Format mpeg probed with size=4096 and score=52
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2500
[mpeg @ 0x7f9eea84b400] Probe with size=794, packets=1 detected mpegvideo
with score=25
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2499
[mpeg @ 0x7f9eea84b400] Probe with size=2809, packets=2 detected mpegvideo
with score=25
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2498
[mpeg @ 0x7f9eea84b400] Probe with size=4824, packets=3 detected mpegvideo
with score=25
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2497
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2496
[mpeg @ 0x7f9eea84b400] Probe with size=8854, packets=5 detected mpegvideo
with score=25
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2495
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2494
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2493
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2492
[mpeg @ 0x7f9eea84b400] Probe with size=16914, packets=9 detected
mpegvideo with score=25
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2491
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2490
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2489
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2488
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2487
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2486
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2485
[mpeg @ 0x7f9eea84b400] probing stream 0 pp:2484
[mpeg @ 0x7f9eea84b400] Probe with size=33034, packets=17 detected
mpegvideo with score=51
[mpeg @ 0x7f9eea84b400] probed stream 0
[mpeg @ 0x7f9eea84b400] max_analyze_duration 5000000 reached at 5005000
Input #0, mpeg, from 'SoundieF.mpeg':
Duration: 00:02:24.10, start: 839.378778, bitrate: 3786 kb/s
Stream #0:0[0x1e0], 152, 1/90000: Video: mpeg2video (Main), yuv420p,
352x480 [SAR 20:11 DAR 4:3], 3500 kb/s, 29.97 fps, 29.97 tbr, 90k tbn,
59.94 tbc
Stream #0:1[0x1c0], 193, 1/90000: Audio: mp2, 48000 Hz, 2 channels,
s16, 224 kb/s
[buffer @ 0x7f9eea41a920] w:352 h:480 pixfmt:yuv420p tb:1/1000000
sar:20/11 sws_param:flags=2
[mpeg2video @ 0x7f9eea853a00] detected 2 logical cores
Output #0, framecrc, to 'SoundieF.framecrc':
Metadata:
encoder : Lavf54.3.100
Stream #0:0, 0, 1001/30000: Video: rawvideo (I420 / 0x30323449),
yuv420p, 352x480 [SAR 20:11 DAR 4:3], q=2-31, 200 kb/s, 29.97 tbn, 29.97
tbc
Stream #0:1, 0, 1/48000: Audio: pcm_s16le, 48000 Hz, 2 channels, s16,
1536 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video -> rawvideo)
Stream #0:1 -> #0:1 (mp2 -> pcm_s16le)
Press [q] to stop, [?] for help
timestamp discontinuity 0, new offset= -839378778
frame= 2 fps=0.0 q=0.0 Lsize= 0kB time=00:00:00.12 bitrate=
29.3kbits/s
video:495kB audio:22kB global headers:0kB muxing overhead -99.917157%
}}}
The output file SoundieF.framecrc contained:
{{{
#tb 0: 1001/30000
#tb 1: 1/48000
1, 0, 0, 1152, 4608, 0xb9620c2a
1, 1152, 1152, 1152, 4608, 0xf005c83b
1, 2304, 2304, 1152, 4608, 0x721c4ffb
0, 2, 2, 1, 253440, 0x1b2dfe2f
1, 3456, 3456, 1152, 4608, 0x01f6156b
1, 4608, 4608, 1152, 4608, 0x6abc95fe
0, 3, 3, 1, 253440, 0x98dca937
}}}
The output contains 6 columns where the documentation only refers to 4.
Are columns 2 and 3 duplicates? pts and dts? I presume column 4 is the
number of samples used? Also the commented timebase is useful but
undocumented.
If relevant I put a similar ticket about framemd5 here:
http://ffmpeg.org/trac/ffmpeg/ticket/1153
thanks
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1159>
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