events:divocptt

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events:divocptt [2020/10/04 14:31] – danimoevents:divocptt [2026/07/26 22:17] (current) – external edit 127.0.0.1
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-= DiVOC Push to Talk+# DiVOC Push to Talk
  
 ---- dataentry event ---- ---- dataentry event ----
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-== Special Post-Production Sauce due to Separate Translation+## Special Post-Production Sauce due to Separate Translation
  
 1. Go to tracker, pick ticket 1. Go to tracker, pick ticket
 2. Click the link for the according talk from https://streaming.media.ccc.de/divoc_ptt/relive, click the "download" link 2. Click the link for the according talk from https://streaming.media.ccc.de/divoc_ptt/relive, click the "download" link
-3. Make sure you have the translator audio for the respective time. Ask stb for the recording (can we link it? might contain private conversation inbetween?)+3. Make sure you have the translator audio for the respective time. See https://wiki.c3lingo.org/translation-recordings
 4. Use ffmpeg to cut the mp4 to the required length without re-encoding: ''ffmpeg -i muxed.mp4 -ss <start> -to <end> -c copy id-<hd>-orig.mp4'', where ''<start>'' and ''<end>'' are timestamps and <id> is the talk's id in the tracker. Check the final length (ffmpeg output or run ffprobe). Note that this method can only split at keyfames, so the final result might be a bit off. If that's not tolerable, you will have to do a reencode (instead of ''-c copy'', use ''-c:a copy -c:v libx264 -bufsize:0 8192k -minrate:0 100k -maxrate:0 2000k -crf:0 18 -profile:0 main''). 4. Use ffmpeg to cut the mp4 to the required length without re-encoding: ''ffmpeg -i muxed.mp4 -ss <start> -to <end> -c copy id-<hd>-orig.mp4'', where ''<start>'' and ''<end>'' are timestamps and <id> is the talk's id in the tracker. Check the final length (ffmpeg output or run ffprobe). Note that this method can only split at keyfames, so the final result might be a bit off. If that's not tolerable, you will have to do a reencode (instead of ''-c copy'', use ''-c:a copy -c:v libx264 -bufsize:0 8192k -minrate:0 100k -maxrate:0 2000k -crf:0 18 -profile:0 main'').
-5. Open the clip in kdenlive or shotcut. open the translation right along with it in a separate audio track. and align the translation so it fits with the original (delay it by a few secs so it feels natural, live translations are never instant). Fit the audio exactly with the video in terms of length, and mute the video's audio. Next, click Render/Export and make sure to only export the audio, as aac/m4a. name the file ''<id>-hd-tl.mp4''. (This can also be done with pure ffmpeg if you feel confident enough) +5. Open the clip in kdenlive or shotcut. open the translation right along with it in a separate audio track. and align the translation so it fits with the original (delay it by a few secs so it feels natural, live translations are never instant). Fit the audio exactly with the video in terms of length, and mute the video's audio. Next, click Render/Export and make sure to only export the audio, as aac/m4a. name the file ''<id>-hd-tl.m4a''. (This can also be done with pure ffmpeg if you feel confident enough) 
-6. Merge translation to the original video: ''ffmpeg -i <hd>-orig.mp4 -i <id>-hd-tl.mp4 -c copy -map 0:v -map 0:a -map 1:a -shortest <id>-hd.mp4''+6. Merge translation to the original video: ''ffmpeg -i <hd>-orig.mp4 -i <id>-hd-tl.m4a -c copy -map 0:v -map 0:a -map 1:a -shortest <id>-hd.mp4''
 7. Verify with ffprobe that there now are one video and two audio tracks on the new file. 7. Verify with ffprobe that there now are one video and two audio tracks on the new file.
 8. Copy the new file to ''releasing.c3voc.de:/video/tmp/divoc_ptt/repair'' 8. Copy the new file to ''releasing.c3voc.de:/video/tmp/divoc_ptt/repair''
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  • Last modified: 2020/10/04 14:31
  • by danimo