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Sur d’autres sites (9003)

  • How to use ffmpeg / x264 2-Pass encoding for multiple bitrate output files

    10 septembre 2019, par Jonesy

    While performing a 2-Pass encode to multiple output files I was receiving the error

    ratecontrol_init: can't open stats file 1 ffmpeg2pass-2.log

    My setup is to do a single first pass and then multiple second pass encodes to output files with different target bitrates using the same first pass results.

    ffmpeg -y -i $INPUT_FILE -an -vcodec libx264 -pass 1 -b:v 700k -f rawvideo /dev/null
    

    
ffmpeg -y -i $INPUT_FILE -i out-aud.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 250k -f mp4 out-250.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 500k -f mp4 out-500.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 700k -f mp4 out-700.mp4

    This sequence resulted in the error listed above. What I discovered thru code-inspection is that ffmpeg/x264 looks for a different set of first-pass files for each second-pass encoding path. The first encoding path uses the set of files originally created

    ffmpeg2pass-0.log
    
ffmpeg2pass-0.log.mbtree

    The second encoding path requires first-pass files with the names

    ffmpeg2pass-2.log
    
ffmpeg2pass-2.log.mbtree

    The third encoding path requires first-pass files with the names starting with ffmpeg2pass-4*, etc.

    My solution was to create soft-links to the originally created set of files with the new names that were required for each pass before running the second-pass command.

    ln -s ffmpeg2pass-0.log ffmpeg2pass-2.log
    
ln -s ffmpeg2pass-0.log.mbtree ffmpeg2pass-2.log.mbtree
    
ln -s ffmpeg2pass-0.log ffmpeg2pass-4.log
    
ln -s ffmpeg2pass-0.log.mbtree ffmpeg2pass-4.log.mbtree

    This seems to work as it results in the output encodes that I needed. However, I don’t know if this method is legitimate. Am I getting sub-optimal encoding results by using a first-pass output for one bitrate (700k) as the input to second-pass encodings for other bitrates ?

  • How to use ffmpeg / x264 2-Pass encoding for multiple bitrate output files

    2 décembre 2014, par Jonesy

    While performing a 2-Pass encode to multiple output files I was receiving the error

    ratecontrol_init: can't open stats file 1 ffmpeg2pass-2.log

    My setup is to do a single first pass and then multiple second pass encodes to output files with different target bitrates using the same first pass results.

    ffmpeg -y -i $INPUT_FILE -an -vcodec libx264 -pass 1 -b:v 700k -f rawvideo /dev/null
    

    
ffmpeg -y -i $INPUT_FILE -i out-aud.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 250k -f mp4 out-250.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 500k -f mp4 out-500.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 700k -f mp4 out-700.mp4

    This sequence resulted in the error listed above. What I discovered thru code-inspection is that ffmpeg/x264 looks for a different set of first-pass files for each second-pass encoding path. The first encoding path uses the set of files originally created

    ffmpeg2pass-0.log
    
ffmpeg2pass-0.log.mbtree

    The second encoding path requires first-pass files with the names

    ffmpeg2pass-2.log
    
ffmpeg2pass-2.log.mbtree

    The third encoding path requires first-pass files with the names starting with ffmpeg2pass-4*, etc.

    My solution was to create soft-links to the originally created set of files with the new names that were required for each pass before running the second-pass command.

    ln -s ffmpeg2pass-0.log ffmpeg2pass-2.log
    
ln -s ffmpeg2pass-0.log.mbtree ffmpeg2pass-2.log.mbtree
    
ln -s ffmpeg2pass-0.log ffmpeg2pass-4.log
    
ln -s ffmpeg2pass-0.log.mbtree ffmpeg2pass-4.log.mbtree

    This seems to work as it results in the output encodes that I needed. However, I don’t know if this method is legitimate. Am I getting sub-optimal encoding results by using a first-pass output for one bitrate (700k) as the input to second-pass encodings for other bitrates ?

  • How to use ffmpeg / x264 2-Pass encoding for multiple bitrate output files

    2 décembre 2014, par Jonesy

    While performing a 2-Pass encode to multiple output files I was receiving the error

    ratecontrol_init: can't open stats file 1 ffmpeg2pass-2.log

    My setup is to do a single first pass and then multiple second pass encodes to output files with different target bitrates using the same first pass results.

    ffmpeg -y -i $INPUT_FILE -an -vcodec libx264 -pass 1 -b:v 700k -f rawvideo /dev/null
    

    
ffmpeg -y -i $INPUT_FILE -i out-aud.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 250k -f mp4 out-250.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 500k -f mp4 out-500.mp4 \
    
$AUDIO_OPTIONS_P2 -vcodec libx264 -pass 2 -b:v 700k -f mp4 out-700.mp4

    This sequence resulted in the error listed above. What I discovered thru code-inspection is that ffmpeg/x264 looks for a different set of first-pass files for each second-pass encoding path. The first encoding path uses the set of files originally created

    ffmpeg2pass-0.log
    
ffmpeg2pass-0.log.mbtree

    The second encoding path requires first-pass files with the names

    ffmpeg2pass-2.log
    
ffmpeg2pass-2.log.mbtree

    The third encoding path requires first-pass files with the names starting with ffmpeg2pass-4*, etc.

    My solution was to create soft-links to the originally created set of files with the new names that were required for each pass before running the second-pass command.

    ln -s ffmpeg2pass-0.log ffmpeg2pass-2.log
    
ln -s ffmpeg2pass-0.log.mbtree ffmpeg2pass-2.log.mbtree
    
ln -s ffmpeg2pass-0.log ffmpeg2pass-4.log
    
ln -s ffmpeg2pass-0.log.mbtree ffmpeg2pass-4.log.mbtree

    This seems to work as it results in the output encodes that I needed. However, I don’t know if this method is legitimate. Am I getting sub-optimal encoding results by using a first-pass output for one bitrate (700k) as the input to second-pass encodings for other bitrates ?

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