lmkanow.blogg.se - What is ffmpeg 18

We add the metadata to the audio vorbis ogg because adding it to the video ogv file wound up making the first video frame not a keyframe (!).

We convert to yuv420p in the rawvideo step because ffmpeg2theora has (i think) some known issues of not handling all yuv422 video inputs (i found at least a few videos that did this).

We do the vorbis audio outside of libtheora (or ffmpeg2theora) to avoid any issues with Audio/Video sync.

Why the double pipe above? Some videos could not go directly to yuv4mpegpipe format such that libtheora (or ffmpeg2theora) would work all the time.

oggzmerge tmp.ogv audio2.ogg -o CapeCodMarsh.ogv.

oggz-comment audio.ogg -o audio2.ogg TITLE=”Cape Cod Marsh” ARTIST=”Tracey Jaquith” LICENSE=”” DATE=”2004″ ORGANIZATION=”Dumb Bunny Productions” LOCATION=.

ffmpeg -y -i CapeCodMarsh.avi -vn -acodec libvorbis -ac 2 -ab 128k -ar 44100 audio.ogg.

ffmpeg -an -deinterlace -s 400×300 -r 20.00 -i CapeCodMarsh.avi -vcodec rawvideo -pix_fmt yuv420p -f rawvideo – | ffmpeg -an -f rawvideo -s 400×300 -r 20.00 -i – -f yuv4mpegpipe – | libtheora-1.0/lt-encoder_example –video-rate-target 512k – -o tmp.ogv.combine the video and audio ogg files to an.add tasty metadata (with liboggz utils).for videos with audio, ffmpeg create a vorbis audio.

pipe its output to *another* ffmpeg to turn the video to “yuv4mpegpipe”.use ffmpeg to turn any video to “rawvideo”.after trying a bunch of tools over a good corpus of wide-ranging videos, i found a neat way to make the Archive derivatives. has started to make theora derivatives for movie files, where we create an Ogg Theora video format output for each movie file.