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Side by Side Diff: patched-ffmpeg-mt/doc/faq.texi

Issue 789004: ffmpeg roll of source to mar 9 version... (Closed) Base URL: svn://chrome-svn/chrome/trunk/deps/third_party/ffmpeg/
Patch Set: '' Created 10 years, 9 months ago
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1 \input texinfo @c -*- texinfo -*- 1 \input texinfo @c -*- texinfo -*-
2 2
3 @settitle FFmpeg FAQ 3 @settitle FFmpeg FAQ
4 @titlepage 4 @titlepage
5 @sp 7 5 @sp 7
6 @center @titlefont{FFmpeg FAQ} 6 @center @titlefont{FFmpeg FAQ}
7 @sp 3 7 @sp 3
8 @end titlepage 8 @end titlepage
9 9
10 10
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230 @section How do I encode videos which play on the iPod? 230 @section How do I encode videos which play on the iPod?
231 231
232 @table @option 232 @table @option
233 @item needed stuff 233 @item needed stuff
234 -acodec libfaac -vcodec mpeg4 width<=320 height<=240 234 -acodec libfaac -vcodec mpeg4 width<=320 height<=240
235 @item working stuff 235 @item working stuff
236 4mv, title 236 4mv, title
237 @item non-working stuff 237 @item non-working stuff
238 B-frames 238 B-frames
239 @item example command line 239 @item example command line
240 ffmpeg -i input -acodec libfaac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +4mv -trellis 2 -aic 2 -cmp 2 -subcmp 2 -s 320x180 -title X output.mp4 240 ffmpeg -i input -acodec libfaac -ab 128kb -vcodec mpeg4 -b 1200kb -mbd 2 -flags +4mv -trellis 2 -aic 2 -cmp 2 -subcmp 2 -s 320x180 -metadata title=X output.mp4
241 @end table 241 @end table
242 242
243 @section How do I encode videos which play on the PSP? 243 @section How do I encode videos which play on the PSP?
244 244
245 @table @option 245 @table @option
246 @item needed stuff 246 @item needed stuff
247 -acodec libfaac -vcodec mpeg4 width*height<=76800 width%16=0 height%16=0 -ar 240 00 -r 30000/1001 or 15000/1001 -f psp 247 -acodec libfaac -vcodec mpeg4 width*height<=76800 width%16=0 height%16=0 -ar 240 00 -r 30000/1001 or 15000/1001 -f psp
248 @item working stuff 248 @item working stuff
249 4mv, title 249 4mv, title
250 @item non-working stuff 250 @item non-working stuff
251 B-frames 251 B-frames
252 @item example command line 252 @item example command line
253 ffmpeg -i input -acodec libfaac -ab 128kb -vcodec mpeg4 -b 1200kb -ar 24000 -mbd 2 -flags +4mv -trellis 2 -aic 2 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -titl e X -f psp output.mp4 253 ffmpeg -i input -acodec libfaac -ab 128kb -vcodec mpeg4 -b 1200kb -ar 24000 -mbd 2 -flags +4mv -trellis 2 -aic 2 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -meta data title=X -f psp output.mp4
254 @item needed stuff for H.264 254 @item needed stuff for H.264
255 -acodec libfaac -vcodec libx264 width*height<=76800 width%16=0? height%16=0? -ar 48000 -coder 1 -r 30000/1001 or 15000/1001 -f psp 255 -acodec libfaac -vcodec libx264 width*height<=76800 width%16=0? height%16=0? -ar 48000 -coder 1 -r 30000/1001 or 15000/1001 -f psp
256 @item working stuff for H.264 256 @item working stuff for H.264
257 title, loop filter 257 title, loop filter
258 @item non-working stuff for H.264 258 @item non-working stuff for H.264
259 CAVLC 259 CAVLC
260 @item example command line 260 @item example command line
261 ffmpeg -i input -acodec libfaac -ab 128kb -vcodec libx264 -b 1200kb -ar 48000 -m bd 2 -coder 1 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -title X -f psp -flags l oop -trellis 2 -partitions parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 output.m p4 261 ffmpeg -i input -acodec libfaac -ab 128kb -vcodec libx264 -b 1200kb -ar 48000 -m bd 2 -coder 1 -cmp 2 -subcmp 2 -s 368x192 -r 30000/1001 -metadata title=X -f psp -flags loop -trellis 2 -partitions parti4x4+parti8x8+partp4x4+partp8x8+partb8x8 output.mp4
262 @item higher resolution for newer PSP firmwares, width<=480, height<=272 262 @item higher resolution for newer PSP firmwares, width<=480, height<=272
263 -vcodec libx264 -level 21 -coder 1 -f psp 263 -vcodec libx264 -level 21 -coder 1 -f psp
264 @item example command line 264 @item example command line
265 ffmpeg -i input -acodec libfaac -ab 128kb -ac 2 -ar 48000 -vcodec libx264 -level 21 -b 640kb -coder 1 -f psp -flags +loop -trellis 2 -partitions +parti4x4+parti 8x8+partp4x4+partp8x8+partb8x8 -g 250 -s 480x272 output.mp4 265 ffmpeg -i input -acodec libfaac -ab 128kb -ac 2 -ar 48000 -vcodec libx264 -level 21 -b 640kb -coder 1 -f psp -flags +loop -trellis 2 -partitions +parti4x4+parti 8x8+partp4x4+partp8x8+partb8x8 -g 250 -s 480x272 output.mp4
266 @end table 266 @end table
267 267
268 @section Which are good parameters for encoding high quality MPEG-4? 268 @section Which are good parameters for encoding high quality MPEG-4?
269 269
270 '-mbd rd -flags +4mv+aic -trellis 2 -cmp 2 -subcmp 2 -g 300 -pass 1/2', 270 '-mbd rd -flags +4mv+aic -trellis 2 -cmp 2 -subcmp 2 -g 300 -pass 1/2',
271 things to try: '-bf 2', '-flags qprd', '-flags mv0', '-flags skiprd'. 271 things to try: '-bf 2', '-flags qprd', '-flags mv0', '-flags skiprd'.
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494 494
495 @section AVStream.r_frame_rate is wrong, it is much larger than the framerate. 495 @section AVStream.r_frame_rate is wrong, it is much larger than the framerate.
496 496
497 r_frame_rate is NOT the average framerate, it is the smallest framerate 497 r_frame_rate is NOT the average framerate, it is the smallest framerate
498 that can accurately represent all timestamps. So no, it is not 498 that can accurately represent all timestamps. So no, it is not
499 wrong if it is larger than the average! 499 wrong if it is larger than the average!
500 For example, if you have mixed 25 and 30 fps content, then r_frame_rate 500 For example, if you have mixed 25 and 30 fps content, then r_frame_rate
501 will be 150. 501 will be 150.
502 502
503 @bye 503 @bye
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