No.248321
. Modify Command:
No.248322
Replace `0:a:0` with the correct audio stream index once identified, for example `0:a:1` if it's the second audio stream:
No.248323
```bash
No.248324
ffmpeg -i input.mkv -map 0:v -map 0:a:X -map 0:s? -c copy output.mkv
No.248325
```
No.248326
Replace `X` with your desired audio stream's actual index number based on what was listed.
No.248327
Note that in your question, using `-map 5:a:0` would attempt mapping from a non-existent sixth input file rather than selecting an internal track within a single input!
No.248330
chatgpt: what if i want to keep two audio streams? map both like this -map 0:a:4 -map 0:a:5 ?
No.248331
[GPT4]|[OpenAI-GPT4o]: Yes, if you want to keep two specific audio streams, you would map each one separately. Assuming `0:a:4` and `0:a:5` are the indices of the audio streams you wish to keep, your command would look like this:
No.248332
```bash
No.248333
ffmpeg -i input.mkv -map 0:v -map 0:a:4 -map 0:a:5 -map 0:s? -c copy output.mkv
No.248334
```
No.248335
This command will include all video streams, the specified audio streams (4 and 5), and all subtitle streams in the output file. Adjust the indices as needed based on your input file's actual stream layout.
No.248361
chatgpt: can i make it map input audio streams by title? the input files have audio stream titles like "English", "Russian", "English Commentary", etc.
No.248363
[GPT4]|[OpenAI-GPT4o]: Yes, you can use `ffmpeg` to map audio streams by title using a script or command that first identifies the stream indices associated with specific titles. However, `ffmpeg` itself does not directly map streams by title in a single command.
No.248365
Here is a general approach:
No.248366
. Identify Stream Titles:
No.248367
First, list all streams and their metadata to identify which ones have the titles you want:
No.248368
```bash
No.248369
ffprobe -v error -show_entries stream=index:stream_tags=title -of default=noprint_wrappers=1 input.mkv
No.248370
```
No.248371
. Use Shell Scripting (Bash Example):
No.248372
You can create a small script to parse this information and construct your `ffmpeg` command dynamically.
No.248373
Here's an example of how such a script might look like in Bash:
No.248374
```bash
No.248375
#!/bin/bash
No.248376
input="input.mkv"
No.248377
output="output.mkv"
No.248378
titles=("English" "Russian")
No.248379
Too many lines! Stopping. Use: 'GPT4: !resume' to continue response.
No.248387
chatgpt: !resume
No.248388
[GPT4]: Resuming last message
No.248389
[GPT4]|[OpenAI-GPT4o]: map_args="-map 0:v"
No.248390
for title in "${titles[@]}"; do
No.248391
index=$(ffprobe -v error -select_streams a \
No.248392
-show_entries stream=index:stream_tags=title \
No.248393
-of csv=p=0 "$input" | grep ",$title" | cut -d ',' -f 1)
No.248394
No.248395
if [[ ! -z $index ]]; then
No.248396
map_args+=" -map 0:a:$index"
No.248397
fi
No.248398
done
No.248399
# Add subtitle mapping if needed:
No.248400
chatgpt: !resume
No.248401
[GPT4]: No message to resume
No.248415
yotgo
No.248419
??
No.248423
Someone made it post scary code on IRC, ban nao.
No.248428
I see. well, this isn't my channel to ban people in
No.248430
you'll have to scrub your log files just to be safe