New submission from Jonathan Haug <jonathanh...@wolke7.net>: Dear Dev-Team,
I'm using the current svn-version of ffmpeg to transcode AVCHD/MTS clips into DNxHD for video editing. This does not work properly when using the "Pre-Rec-function" [1] of my camcorder, a Panasonic SD 300. In the transcoded files, video and audio are out of sync. The command I'm using is: ffmpeg -i input.MTS -s 1280x720 -deinterlace -r 25 -b 60M -threads 8 -vcodec dnxhd -acodec pcm_s16le -ar 48000 -ac 2 output.mov (and I already played a lot with different settings of -async, -vsync an -copyts) Below you will find the ouput of ffmpeg -v 9 -loglevel 99. If I do _not_ use the Pre-Rec-function, everything works as expected. You may check this on your own with the following files: sd300-PreRec-avchd.MTS (original sample from camcorder with PreRec) http://ubuntuone.com/p/Lij/ sd300-PreRec-dnxhd.mov http://ubuntuone.com/p/LjM/ sd300-standard-avchd.MTS (original sample from camcorder w/o PreRec) http://ubuntuone.com/p/Lin/ sd300-standard-dnxhd.mov http://ubuntuone.com/p/LjN/ [1] The Pre-Rec-function: Pre-Rec enables the camcorder to continuously record three seconds (while in the Pre-Rec mode) internal buffer memory. Then, when the Record button is actually pressed, the three seconds immediately prior are added at the beginning of the clip. (from panasonic.com) $ ffmpeg -v 9 -loglevel 99 -i sd300-PreRec-avchd.MTS FFmpeg version SVN-r25553, Copyright (c) 2000-2010 the FFmpeg developers built on Oct 23 2010 06:08:20 with gcc 4.4.3 configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-postproc --enable-pthreads --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libx264 --enable-libxvid --enable-x11grab libavutil 50.32. 3 / 50.32. 3 libavcore 0. 9. 1 / 0. 9. 1 libavcodec 52.93. 0 / 52.93. 0 libavformat 52.84. 0 / 52.84. 0 libavdevice 52. 2. 2 / 52. 2. 2 libavfilter 1.53. 0 / 1.53. 0 libswscale 0.12. 0 / 0.12. 0 libpostproc 51. 2. 0 / 51. 2. 0 [NULL @ 0x22454c0] Probed with size=2048 and score=100 [mpegts @ 0x22454c0] stream=0 stream_type=1b pid=1011 prog_reg_desc=HDMV [mpegts @ 0x22454c0] stream=1 stream_type=81 pid=1100 prog_reg_desc=HDMV [mpegts @ 0x22454c0] stream=2 stream_type=90 pid=1200 prog_reg_desc=HDMV [h264 @ 0x224b270] Frame num gap 236 0 [h264 @ 0x224b270] Frame num gap 236 1 [h264 @ 0x224b270] Frame num gap 236 2 [ .... 230 similar lines cutted ..... ] [h264 @ 0x224b270] Frame num gap 236 232 [h264 @ 0x224b270] Frame num gap 236 233 [h264 @ 0x224b270] Frame num gap 236 234 [h264 @ 0x224b270] no picture [mpegts @ 0x22454c0] Probe buffer size limit 5000000 reached Seems stream 0 codec frame rate differs from container frame rate: 50.00 (50/1) -> 50.00 (50/1) Input #0, mpegts, from 'temp/sd300-PreRec-avchd.MTS': Duration: 00:00:11.48, start: 13.833589, bitrate: 16190 kb/s Program 1 Stream #0.0[0x1011], 121, 1/90000: Video: h264, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], 1/50, 50 fps, 50 tbr, 90k tbn, 50 tbc Stream #0.1[0x1100], 81, 1/90000: Audio: ac3, 48000 Hz, 5.1, s16, 384 kb/s Stream #0.2[0x1200], 25, 1/90000: Subtitle: pgssub At least one output file must be specified ---------- messages: 12339 priority: normal status: new substatus: new title: AVCHD -> DNxHD: a/v out of sync when using Pre-Rec on camcorder type: bug ________________________________________________ FFmpeg issue tracker <iss...@roundup.ffmpeg.org> <https://roundup.ffmpeg.org/issue2319> ________________________________________________
