Sinn und Zweck eines 2-Pass-Encodings ist es, eine vorher festgelegte Dateigröße exakt zu treffen und dabei die subjektiv empfundene Videoqualität im Verlauf des Films möglichst konstant zu halten.

YouTube or Netflix are using 2-pass or even 3-pass algorithms, where in the latter, a CRF encode for a given source determines the best bitrate at which to 2-pass encode your stream. The additional quality of the 2-pass encoding will pay off every time you watch the movie. 2-Pass und N-Pass¶. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Take our short survey.

What is the most preferable way to encode internet video? Ask Question Asked 8 years, 11 months ago. On the other hand, since the first pass is typically much faster than the second pass, the difference in overall encoding time isn't that large, with two-pass taking about 25 percent longer. Hello, i am trying to encode with a variable bitrate, 2 pass encoding, using the codec hevc_nvenv. 2-Pass war nie und ist nicht die Methode, um das wolkige Ideal von »maximaler Qualität« zu erfüllen. Learn more .

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Streaming nowadays is done a little more cleverly. You're right that the quality difference between 2-pass VBR and 1-pass ABR is small when working at high bitrates. Viewed 5k times 2.

-b:v "20000000" means "target an average bitrate of 20Mbps". My doubt is that ffmpeg do not iterate the encoding two times creating a logfile. Viewed 144 times 0. Active 8 years, 10 months ago. $ ffmpeg -i "input.mp4" -c:v "libx264" -b:v 20000000 -pix_fmt:v "yuv420p" -pass 2 -c:a "aac" -b:a "128000" -f "mp4" -movflags "faststart" output.mp4. 2.

I'm not convinced that your original problem will be solved 2-pass, but above is the command anyway. They can make sure that enough bitrate is reserved for complex scenes while not exceeding your bandwidth. What ffmpeg output format (-f) do I use for two-pass encoding of mkv files. Endeavour lifts off from Kennedy Space Center on the STS-127 mission to complete construction of the Japanese Kibo module on the International Space Station.

Summary of the bug: with some really old version of ffmpeg I would use 2 pass encoding to convert anyfile to AVI/XVID at medium/low resolution (900k), but all newer versions of FFMPEG ignores "bitrate" parameter at "2nd pass" encoding and this result in a file bigger and at high bitrate (as if … ffmpeg.exe -y -i 123.avi -pass 1 -passlogfile text.log -threads 2 -vcodec libx264 -f mp4 -aspect 16:9 -r 25 -s 480x340 -b 512kb -minrate 512kb -maxrate 512kb -bufsize 2048k -an output.mp4 ffmpeg.exe -y -i 123.avi -pass 2 -passlogfile text.log -threads 2 -vcodec libx264 -f mp4 -aspect 16:9 -r 25 -s 480x340 -b 512kb -minrate 512kb -maxrate 512kb -bufsize 2048k -acodec libfaac -ac 2 -ab 128kb … I recently backed up one of my Blu-ray movies and it is about 36 GB. Internet Video | FFMPEG | 2-PASS encoding vs. 1-PASS CRF.

ffmpeg -i infile.mkv -vcodec hevc_nvenc -preset slow -qmin 1 -qmax 50 -b:v 4000k -c:a copy -f matroska outfile.mkv Theorically it shoulds use 2 pass encode, and it encodes with half speed respect to preset medium. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more .