Converting .flv to .wav for CD

[vhman]

I am converting some youtube videos to wav or mp3 to burn to audio cd's and have found a strange problem. It seems like some files will only encode and burn correctly if I use a certain encoder ( I have ffmpeg , winx flv to mp3 , avidemux , format factory , and vlc player - one of these usually works ). The files I am converting use acc audio with a sample rate of 44100 and a bitrate of 131 kb/s according to ffmpeg. When I use ffmpeg I use the command lines :

ffmpeg -i inputFile.flv -ac 2 -vn outputFile.wav  //this command works for some files

ffmpeg -i inputFile.flv  -acodec pcm_s16le -ac 2 -ab 128 -vn -y outputFile.wav  //this command works for other files

Is there one set of ffmpeg commands that can convert all the audio for burning to cd ( I'd like to just use one encoder since I can't tell which one works properly until I burn the encoded files to a cd-rw disk to see if it plays properly )? Is there a way to look at the video's specifications to tell which command to use to encode it? Thanks for any information...

[hech54]

How about opening WinFF.....a program where you can actually SEE and SELECT things?

[vhman]

I actually have Winff as well and the front-end generates this ffmpeg command for .wav for CD files:

"C:\Program Files\WinFF\ffmpeg.exe" -y -i input.flv" -vn -ar 44100 "output.wav"

but I haven't had any luck with this command either. I've tried other GUI front-ends for ffmpeg but can't seem to find a command that works for every file. I'm looking for a way to figure out which command to use for which file ( the audio stream specifications of all the files seem identical , but the video aspects differ from file to file - I'm not sure if this has anything to do with the problem ). Anyone know of any books on ffmpeg? Thanks for any information....

[hech54]

If it doesn't work in WinFF then you will need to find another solution since FLV files are bastards from the start. Option 2 for me is SUPER ....but nowadays SUPER is so full of malware/spyware garbage it is no longer a viable option. I use an antique version of SUPER and will never upgrade.

[Hoser Rob]

In windows I'd probably try opening the video file in audacity, which will open just the audio stream from it. Very convenient. Then your choices will be much broader. You could probably use audacity itself.

I've done just this a bunch of times.

[Cornucopia]

You could try demuxing the audio first (with FLVExtract) and then open the raw audio file in an audio editor (Audacity, etc).

Scott

[bat999]

Is there one set of ffmpeg commands that can convert all the audio for burning to cd...

If this command doesn't work then you probably have corrupt flv files or your version of FFmpeg needs to be updated:-

ffmpeg -i inputFile.flv -acodec pcm_s16le -ar 44100 -ac 2 outputFile.wav

[ozok]

You can try TAudioConverter. Also ffmpeg's output will tell you what is wrong, please post it here.

[El Heggunte]

ffmpeg's output will tell you what is wrong, please post it here.

What build of ffmpeg do you have? I use the builds from Zeranoe, and different than the builds from the deceased arrozcru Web site, they say absolutely nothing when an error happens.

[ozok]

I use ffmpeg builds from http://ffmpeg.zeranoe.com/builds/ too. Did you try TAC? Maybe logs there can help you spot what's wrong.

[smrpix]

bat999's code should work in just about any version of ffmpeg that's ever been written.

Or create a winff preset like this:
-acodec pcm_s16le -ar 44100 -ac 2

and make sure to put "wav" in the file extension box.

[vhman]

Thanks for the replies! I used this command to code a file:

ffmpeg -i inputFile.flv -acodec pcm_s16le -ar 44100 -ac 2 outputFile.wav

and the CD was not recognized by my CD player. If I use the command:

 ffmpeg -i inputFile.flv  -acodec pcm_s16le -ac 2 -ab 128 -vn -y outputFile.wav

the CD will play but a static type noise occurs during high frequency tones. If I encode the files with Format
Factory the CD will play fine , but will stop half-way through the total duration. I can't figure out why I get different
results from different encoders ( I assume the algorithm to encode the video would be the same ).

What build of ffmpeg do you have? I use the builds from Zeranoe, and different than the builds from the
deceased arrozcru Web site, they say absolutely nothing when an error happens.

I am using ffmpeg version N-49044-g89afa63 which I recently got from http://ffmpeg.zeranoe.com/builds/ . I'll give
some of the other suggestions a try when I get a chance ( Audacity , FLVextract , etc. ). The strange thing is
I can encode a .flv file to MPEG-2 for DVD very reliably with ffmpeg , but encoding just the audio stream seems
very tricky .....