how to edit H.264 FLV without converting?

[marada]

Is there any way to edit high definition H.264 FLV video downloaded form Youtube? I know I can convert this to another format and then edit, however if possible I want to keep in this format so no quality is lost. I know Moyea FLV editor is a dedicated FLV editor, however it does not currently handle H.264 FLV file input. Does anyone know of any other products that may be suitable? My goal is to cut a segment from the downloaded video (Audio must stay the same and not be edited) and put a picture at the start and end of the video showing my website name and logo. Any ideas if I don’t want to convert, but keep the video as H.264 FLV?

[Placio74]

Try Avidemux...


BTW
You can remux FLV (with AVC/AAC) to MP4 container (without reencoding of course).

[DarrellS]

Like Placio suggested, remux to mp4.

you can use fLVextract to extract the files and remux with Yamb or My MP4Box or you can use Avanti GUI and ffmpeg to copy the audio and video into an mp4 container.

Then use Avidemux to edit the mp4.

If you have a bunch of these files then it might be easier to use a batch file to remux to mp4. Put all these files in their own folder with a copy of ffmpeg.exe and this batch file.

for %%a in ("*.flv") do ffmpeg -i %%a -vcodec copy -acodec copy %%~na.mp4

Use notepad and save as FLV2MP4.bat. Doubleclick the bat file and it will remux all your FLV files to MP4 files.


It's my experience with trying to use Avidemux to change the container that I get corrupted files. ffmpeg doesn't give me this problem.


(Thanks to Placido74, Baldrick and Richardouk)

[marada]

I have been reading a bit obout Avidemux and it seems many people report audio / video sync problems? Do you know if there are any commerical alternatives that do a better job? Any all in one solutions, or ven one that can handle these HD FLV files directly?

[DarrellS]

I don't know about commercial software.

I downloaded Avanti-GUI which is a frontend for ffmpeg and a couple of youtube trailers and both came out perfect with no sync issues. You'll need to install ffmpeg and avisynth if you don't have them already.

Open FLV file in Avanti > choose ouput folder > set video to copy > set audio to copy > set container to MP4 and hit the Start Process button.