On 9/8/17, Mike Brown <[email protected]> wrote: > On Fri, Sep 08, 2017 at 09:34:50AM +0200, Paul B Mahol wrote: >> On 9/8/17, Mike Brown <[email protected]> wrote: >> > On Fri, Sep 08, 2017 at 12:54:12AM +0200, Carl Eugen Hoyos wrote: >> >> (Sorry, my knowledge of SMPTE 337M is limited but I know that so far, >> >> this is the only "format" for which FFmpeg supports Dolby-E, and that >> >> adding support for other formats will be possible but hasn't been >> >> done yet.) >> > >> > From what I understand, reading the synopsis of SMPTE-337M, is that it >> > is >> > not a container specifically for Dolby-E. I couldn't anything out of it >> > to >> > indicate that it can even handle Dolby-E. >> > >> > That said, I do deal with SMPTE-302M, which is the spec for which >> > Dolby-E is >> > applied to Transport Streams. In my case satellite feeds (not for the >> > consumer). The spec talks about MPEG-2 TS streams, but it applies to >> > H.264 >> > streams as well. >> > >> > Right now, I use ffmpeg to extract the stream into a 2-ch WAVE file, in >> > which >> > I use in another program to extract the audio into 6 mono WAVE files. I >> > then >> > use ffmpeg to encode a AC3 file. >> > >> > Are you saying that I can use ffmpeg and get to a final ac3 file in a >> > single >> > step? >> >> No, you would need to copy audio to raw container, this raw container >> would be >> then detected as Dolby-E. >> >> ffmpeg -i input.wav -c:a copy -f u8 out.u8 >> >> ffmpeg -i out.u8 -c:a ac3 ..... > > Could this not be done as a series of pipes: > > ffmpeg -i input.ts -map 0:2 -c:a pcm_s24le -f wav - | \ > ffmpeg -i - -c:a copy -f u24le - | \ > ffmpeg -drc_scale 0 -i - -c:a ac3 -ab 640k -center_mixlev 0.707 output.ac3 > > Will the 5.1 audio be mapped correctly? > > The Dolby-E is 24bit, not 8.
Doesn't matter, your example will not work, try it. _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
