问题
I have a number of old crusty Real Media files I need to convert and was hoping to write a script to batch process them. I'm able to do a Real Media -> AVI conversion with FFMpegX, but when I try to replicate the conversion with ffmpeg, it always errors out with something like:
[avi @ 0x10084fa00] Too large number of skipped frames 117425 > 60000
It may have something to do with the funky format of these Real Media files:
Duration: 01:28:23.42, start: 0.000000, bitrate: 448 kb/s
Stream #0:0: Data: none, 32 kb/s
Stream #0:1: Data: none, 192 kb/s
Stream #0:2: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
Stream #0:3: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:4: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 8 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:5: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:6: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 27 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:7: Audio: cook (cook / 0x6B6F6F63), 22050 Hz, mono, fltp, 32 kb/s
Stream #0:8: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 192 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
Stream #0:9: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 136 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
Stream #0:10: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
Stream #0:11: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
Stream #0:12: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:13: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:14: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:15: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Does anyone have any tips on either how to find out what FFMpegX is doing to make the conversion work, or a better way to go about using ffmpeg to do this?
EDIT
Including the ffmpeg command (thank you to @Mondain for teaching me about the stream mapping!) and output:
Command:
ffmpeg -i cc121307pm.rm -map 0:8 -map 0:7 -c:v libx264 -c:a libfaac -b:a 32k test.avi
Output:
ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Aug 7 2013 12:29:30 with gcc 4.2.1 (GCC) (Apple Inc. build 5664)
configuration: --prefix=/usr/local/Cellar/ffmpeg/1.2.1 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --enable-avresample --enable-vda --cc=/usr/bin/gcc-4.2 --host-cflags='-Os -w -pipe -march=core2 -msse4.1 -mmacosx-version-min=10.6' --host-ldflags=-L/usr/local/lib --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
libavutil 52. 18.100 / 52. 18.100
libavcodec 54. 92.100 / 54. 92.100
libavformat 54. 63.104 / 54. 63.104
libavdevice 54. 3.103 / 54. 3.103
libavfilter 3. 42.103 / 3. 42.103
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[rm @ 0x10180f200] Unsupported stream type 00000265
[rm @ 0x10180f200] Unsupported stream type 00000652
[rm @ 0x10180f200] max_analyze_duration 5000000 reached at 5004000 microseconds
Input #0, rm, from 'input.rm':
Metadata:
File ID : 41deac0f-94fb-3595-325c-c717943bc532
Content Rating : (PICS-1.1 "http://www.classify.org/safesurf" labels comment "RealProducer Plus 8.5.0.200 Windows" ratings (SS~~000 1))
Modification Date: 12/13/2007 16:26:16
Generated By : RealProducer Plus 8.5.0.200 Windows
Keywords :
Abstract :
Target Audiences: 28K Modem (20 Kbps);56K Modem (34 Kbps);256K DSL/Cable Modem (225 Kbps);
Video Quality : Normal Motion Video
Audio Format : Voice Only
Creation Date : 12/13/2007 14:57:49
ASMRuleBook : #($Bandwidth < 15000),Stream2Bandwidth = 6500, Stream3Bandwidth = 5499;#($Bandwidth >= 15000) && ($Bandwidth < 20000),Stream2Ba
title :
author :
copyright : ?2007
comment :
Duration: 01:28:23.42, start: 0.000000, bitrate: 448 kb/s
Stream #0:0: Data: none, 32 kb/s
Stream #0:1: Data: none, 192 kb/s
Stream #0:2: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
Stream #0:3: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:4: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 8 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:5: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:6: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 27 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:7: Audio: cook (cook / 0x6B6F6F63), 22050 Hz, mono, fltp, 32 kb/s
Stream #0:8: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 192 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
Stream #0:9: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 136 kb/s, 30 fps, 30 tbr, 1k tbn, 1k tbc
Stream #0:10: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
Stream #0:11: Audio: sipr (sipr / 0x72706973), 8000 Hz, mono, flt, 6 kb/s
Stream #0:12: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:13: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:14: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 13 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
Stream #0:15: Video: rv20 (RV20 / 0x30325652), yuv420p, 320x240, 5 kb/s, 15 fps, 15 tbr, 1k tbn, 1k tbc
[libx264 @ 0x101889c00] using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.1 Cache64
[libx264 @ 0x101889c00] profile High, level 1.3
Output #0, avi, to 'test.avi':
Metadata:
File ID : 41deac0f-94fb-3595-325c-c717943bc532
Content Rating : (PICS-1.1 "http://www.classify.org/safesurf" labels comment "RealProducer Plus 8.5.0.200 Windows" ratings (SS~~000 1))
Modification Date: 12/13/2007 16:26:16
Generated By : RealProducer Plus 8.5.0.200 Windows
Keywords :
Abstract :
Target Audiences: 28K Modem (20 Kbps);56K Modem (34 Kbps);256K DSL/Cable Modem (225 Kbps);
Video Quality : Normal Motion Video
Audio Format : Voice Only
Creation Date : 12/13/2007 14:57:49
ASMRuleBook : #($Bandwidth < 15000),Stream2Bandwidth = 6500, Stream3Bandwidth = 5499;#($Bandwidth >= 15000) && ($Bandwidth < 20000),Stream2Ba
INAM :
author :
ICOP : ?2007
ICMT :
ISFT : Lavf54.63.104
Stream #0:0: Video: h264 (H264 / 0x34363248), yuv420p, 320x240, q=-1--1, 30 tbn, 30 tbc
Stream #0:1: Audio: aac ([255][0][0][0] / 0x00FF), 22050 Hz, mono, s16, 32 kb/s
Stream mapping:
Stream #0:8 -> #0:0 (rv20 -> libx264)
Stream #0:7 -> #0:1 (cook -> libfaac)
Press [q] to stop, [?] for help
[rm @ 0x10180f200] DATA tag in middle of chunk, file may be broken.
Truncating packet of size 775215378 to 283607526
[rm @ 0x10180f200] Impossibly sized packet
Truncating packet of size 686581284 to 279055389
[rm @ 0x10180f200] Impossibly sized packet
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[rm @ 0x10180f200] DATA tag in middle of chunk, file may be broken.
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input.rm: Input/output error
frame= 0 fps=0.0 q=0.0 Lsize= 10kB time=00:00:00.00 bitrate=N/A
video:0kB audio:0kB subtitle:0 global headers:0kB muxing overhead inf%
Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)
回答1:
It would appear that your file contains several streams and when working with ffmpeg, you will need to select the ones you want to convert. One would assume that you want an Audio / Video pair at the highest quality within the file. Here is how you use the "map" option to target streams: http://trac.ffmpeg.org/wiki/How%20to%20use%20-map%20option
If I had this file I would use this command:
ffmpeg -i [real-input-file] \
-map 0:8 -map 0:7 \
-c:v libx264 \
-c:a libfaac -b:a 32k \
output.mkv
来源：https://stackoverflow.com/questions/18108323/converting-real-media-with-ffmpeg