I'm a heavy user of the Vegas 12 video editor. I record junior soccer matches with 2 cameras and two extra ext. sound recorders. Sometimes I notice a mixing balance problem in a rendered MP4 and need just to replace a remixed version of the audio stream in the MP4. Vegas won't output just a raw AAC file. But it will output a MP4 containing just the audio.
So what I want to do is create a Windows desktop icon of a batchfile where I can drag-and-drop an affected MP4. The batchfile will then look for the presence of "replacement.mp4", the AAC-only MP4, in the same directory as the affected MP4. (I'll always use the same name for the fixed audio file.) If found, it will then perform the following sequence of FFMPEG commands (using "test.mp4" as an example of an AVC+AAC MP4 which needs to have its audio stream replaced): ffmpeg -i test.mp4 -an -c:v copy test.h264 ffmpeg -i replacement.mp4 -vn -c:a copy replacement.aac ffmpeg -i test.h264 -i replacement.aac -c copy test_replacement.mp4 The compression formats and stream indices will always be the same so I don't need to do any checking for that. 1. Is this the most efficient way to perform this task? Could I mux the AVC stream in test.mp4 with the AAC stream in replacement.mp4 without first demuxing them. That is, could this all be performed in one FFMPEG command? 2. I get these warnings during the muxing: "Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly" and a lot of "pts has no value". The audio appears to be in sync in the 18 minute clip I produced, so I don't think these warning are significant here. What do you think? 1 minutes versions of test.mp4 (720p50) and replacement.mp4 are available here: https://dl.dropboxusercontent.com/s/z7a7dh1dgqohx17/test.mp4 https://dl.dropboxusercontent.com/s/s6cax255fugc3ny/replacement.mp4 Dan. _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
