hello everbody, i converted a quicktime video to x264 and theora to embed it in a website via html5.
for the x264 conversion i used "handbrake" and for theora i used "theora converte .net" i dont know much about video encoding so i only specified the basic settings in handbrake and theora converter
video bitrate: 3000kbs
audo bitrate: 128kbs
size: 940x528
fps: 25
the output looks like that:
the x264 version is perfect, but the theora version looks blurry. any tips how i could improve the theora quality. i also tried vlc to convert to theora. the output theora video from vlc looks better than the one from "theora converter .net". but the vlc video is messed up. the vlc video is stuttering.
many thanks in advance!
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now i have tried ffmpeg2theora and ffCoder. But with the same blurry resulst. I have been looking for a "sharpen" option in those programs, but did not find anything. Is this "Theora Codec" built in ffmpeg2theora and ffCoder? Or do those programs use codecs installed on my computer? Do i have to update any Theora Codecs on my computer? Maybe its not possible to get a sharper image with the theora codec? Sorry but as i mentioned before i am not an expert in video encoding. Any help or tips are greatly appreciated
regards rettew -
As I understand it ffCoder and theoraconverter.net both act as front-ends for ffmpeg2theora, which is bundled with both programs.
I have almost zero experience with theoraconverter.net, but I would try turning the post processing preset to none just to see if that is blurring the image during decoding. -
try out more settings with vlc and see if you can get it playing smoothly
you also need to fill out your computer profile...your box may not be powerful enough to play smoothly -
JMHO, but the correct way of encoding to Theora is by using directly either the
(infamous) "example encoder" or ffmpeg2theora. This latter accepts AVS files
as input via avs2yuv. Not newbie-friendly, I know, but only this method will allow you to
have full-control on the quality of the encodes. And "forgetting" HTML 5 for a moment,
you'll possibly find interesting to remux your Theora videos to a more-versatile container,
such as MKV or AVI.
Code:ffmpeg2theora 0.27 - Xiph.Org libtheora 1.1 20090822 (Thusnelda) Usage: ffmpeg2theora [options] input General output options: -o, --output alternative output filename --no-skeleton disables ogg skeleton metadata output --skeleton-3 outputs Skeleton Version 3, without keyframe indexes -s, --starttime start encoding at this time (in sec.) -e, --endtime end encoding at this time (in sec.) -p, --preset encode file with preset. Right now there is preview, pro and videobin. Run 'ffmpeg2theora -p info' for more informations Video output options: -v, --videoquality [0 to 10] encoding quality for video (default: 6) use higher values for better quality -V, --videobitrate encoding bitrate for video (kb/s) --soft-target Use a large reservoir and treat the rate as a soft target; rate control is less strict but resulting quality is usually higher/smoother overall. Soft target also allows an optional -v setting to specify a minimum allowed quality. --two-pass Compress input using two-pass rate control This option requires that the input to the to the encoder is seekable and performs both passes automatically. --first-pass <filename> Perform first-pass of a two-pass rate controlled encoding, saving pass data to <filename> for a later second pass --second-pass <filename> Perform second-pass of a two-pass rate controlled encoding, reading first-pass data from <filename>. The first pass data must come from a first encoding pass using identical input video to work properly. --optimize optimize video output filesize (slower) (same as speedlevel 0) --speedlevel encoding is faster with higher values the cost is quality and bandwidth - 0: Slowest (best) - 1: Enable early skip (default) - 2: Disable motion compensation -x, --width scale to given width (in pixels) -y, --height scale to given height (in pixels) --max_size scale output frame to be within box of given size, height optional (%d[x%d], i.e. 640x480) --aspect define frame aspect ratio: i.e. 4:3 or 16:9 --pixel-aspect define pixel aspect ratio: i.e. 1:1 or 4:3, overwrites frame aspect ratio -F, --framerate output framerate e.g 25:2 or 16 --croptop, --cropbottom, --cropleft, --cropright crop input by given pixels before resizing -K, --keyint [1 to 2147483647] keyframe interval (default: 64) -d --buf-delay <n> Buffer delay (in frames). Longer delays allow smoother rate adaptation and provide better overall quality, but require more client side buffering and add latency. The default value is the keyframe interval for one-pass encoding (or somewhat larger if --soft-target is used) and infinite for two-pass encoding. (only works in bitrate mode) --no-upscaling only scale video or resample audio if input is bigger than provided parameters Video transfer options: --pp Video Postprocessing, denoise, deblock, deinterlacer use --pp help for a list of available filters. -C, --contrast [0.1 to 10.0] contrast correction (default: 1.0) Note: lower values make the video darker. -B, --brightness [-1.0 to 1.0] brightness correction (default: 0.0) Note: lower values make the video darker. -G, --gamma [0.1 to 10.0] gamma correction (default: 1.0) Note: lower values make the video darker. -Z, --saturation [0.1 to 10.0] saturation correction (default: 1.0) Note: lower values make the video grey. Audio output options: -a, --audioquality [-2 to 10] encoding quality for audio (default: 1) use higher values for better quality -A, --audiobitrate [32 to 500] encoding bitrate for audio (kb/s) -c, --channels set number of output channels -H, --samplerate set output samplerate (in Hz) --noaudio disable audio from input --novideo disable video from input Input options: --deinterlace force deinterlace, otherwise only material marked as interlaced will be deinterlaced -f, --format specify input format --inputfps fps override input fps --audiostream id by default the first audio stream is selected, use this to select another audio stream --videostream id by default the first video stream is selected, use this to select another video stream --nosync do not use A/V sync from input container. try this if you have issues with A/V sync Subtitles options: --subtitles file use subtitles from the given file (SubRip (.srt) format) --subtitles-encoding encoding set encoding of the subtitles file supported are utf-8, utf8, iso-8859-1, latin1 --subtitles-language language set subtitles language (de, en_GB, etc) --subtitles-category category set subtitles category (default "subtitles") --subtitles-ignore-non-utf8 ignores any non UTF-8 sequence in UTF-8 text --nosubtitles disables subtitles from input (equivalent to --subtitles=none) --subtitle-types=[all,text,spu,none] select what subtitle types to include from the input video (default text) Metadata options: --artist Name of artist (director) --title Title --date Date --location Location --organization Name of organization (studio) --copyright Copyright --license License --contact Contact link --nometadata disables metadata from input --no-oshash do not include oshash of source file(SOURCE_OSHASH) Keyframe indexing options: --index-interval <n> set minimum distance between indexed keyframes to <n> ms (default: 2000) --theora-index-reserve <n> reserve <n> bytes for theora keyframe index --vorbis-index-reserve <n> reserve <n> bytes for vorbis keyframe index --kate-index-reserve <n> reserve <n> bytes for kate keyframe index Other options: -P, --pid fname write the process' id to a file -h, --help this message --info output json info about input file, use -o to save json to file --frontend print status information in json, one json dict per line Examples: ffmpeg2theora videoclip.avi (will write output to videoclip.ogv) ffmpeg2theora videoclip.avi --subtitles subtitles.srt (same, with subtitles) cat something.dv | ffmpeg2theora -f dv -o output.ogv - Encode a series of images: ffmpeg2theora frame%06d.png -o output.ogv Live streaming from V4L Device: ffmpeg2theora /dev/video0 -f video4linux --inputfps 15 -x 160 -y 128 -o - \ | oggfwd icast2server 8000 password /theora.ogv (you might have to use video4linux2 depending on your hardware) Live encoding from a DV camcorder (needs a fast machine): dvgrab - | ffmpeg2theora -f dv -x 352 -y 288 -o output.ogv - Live encoding and streaming to icecast server: dvgrab --format raw - \ | ffmpeg2theora -f dv -x 160 -y 128 -o /dev/stdout - \ | oggfwd icast2server 8000 password /theora.ogv
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thanks everybody for the help!
after a lot of tests i figured out the problem: my source file (quicktime with animation codec) caused the blurry video.
quicktime source in handbrake -> no probelm in x264 output
quicktime source in ffmpeg2theora -> blurry video
now i used the x264 as the source video in ffmpeg2theora.
the output looks like this:
problem solved
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